AutoCAD Glossary from A to Z — AutoCAD

AutoCAD Glossary — 158 definitions

All terms defined in the 32 sections of the guide, listed in alphabetical order.
Tip: use Ctrl + F to search for a term on the page.

.NET / ObjectARX: More powerful programming interfaces for developing complex AutoCAD applications.
3D: Modeling in space with the Z axis in addition to X and Y. Solids, surfaces, meshes.
Subscription: AutoCAD licensing mode (monthly/yearly) giving access to the software, toolsets and the cloud.
Object snap (Osnap): A helper that "snaps" the cursor to precise points on objects (endpoint, midpoint, center, intersection…).
Trim (TRIM / TR): Cut the portion of an object that extends beyond a cutting edge.
Command alias: Keyboard abbreviation for a command (L=LINE, Z=ZOOM, C=CIRCLE…) to work faster.
Command alias (PGP): Short keyboard shortcut associated with a command (CO=COPY), editable via the acad.pgp file / ALIASEDIT.
APPLOAD: Command to load a LISP (or other) file to make its functions available.
Associativity: 2D views remain linked to the 3D model: they update when the solid changes.
Attach / Overlay: Attach: the Xref follows into nested Xrefs. Overlay: it does not propagate to higher levels.
Block attribute: Text data attached to a block (reference, dimension, title block text), entered at insertion time.
AutoCAD: Autodesk CAD software for precise 2D and 3D technical drafting. Industry standard since 1982.
AutoCAD Architecture: Building-specialized toolset: intelligent architectural objects (walls, doors, windows, stairs).
AutoCAD Electrical: Toolset specialized for industrial electrical schematics (symbols, tagging, bill of materials).
AutoCAD Map 3D: Toolset linking AutoCAD to GIS: georeferencing, geospatial data, database-linked objects.
AutoCAD Mechanical: Mechanical-specialized toolset: standardized libraries, mechanical dimensioning, automatic bill of materials.
Autodesk Access: Application for managing (downloading, installing, updating) Autodesk software on your workstation.
AutoLISP: Programming language built into AutoCAD, used to create commands and automate tasks.
Independence: Ability to complete a simple drawing on your own, knowing which command to use at each step.
Sweep / Loft: Sweep: follow a profile along a path. Loft: connect multiple successive profiles.
Block library: Collection of reusable blocks, accessible via tool palettes or DesignCenter.
Standard component library: Thousands of standardized elements (screws, nuts, bearings, profiles) ready to insert (ISO, DIN, ANSI…).
BIM: Building Information Modeling: digital model enriched with data. Revit's flagship domain.
Block: Group of objects combined into a single named and reusable element (door, symbol, furniture…).
Dynamic block: Parametric block with grips: stretch, rotate, size, multiple states, from a SINGLE definition.
Layer: "Transparent sheet" grouping objects of the same type (walls, dimensions, text…) with shared properties.
Current layer: The layer on which new objects are created. Must be set before drawing.
Title block: Standardized frame identifying the document (title, scale, date, author, revision, sheet number).
ACP Certification: Autodesk Certified Professional: AutoCAD. Official certification attesting professional-level competency.
Field: Dynamic text linked to data (date, file name, scale, area…) that updates automatically.
Sheet set fields: Data (sheet number, title, revision, total) automatically populated in title blocks.
Chamfer (CHAMFER / CHA): Connect two objects with an angled segment (bevel) using specified distances.
Reference path: Location of the linked file. A broken path (moved file) breaks the Xref: handle with care.
Civil 3D: Software dedicated to infrastructure and civil engineering (terrain, roads, utilities, earthworks).
Custom command: New command created by programming, callable like a native command.
Autodesk account: Unique identifier to download, install and activate Autodesk software and manage your licenses.
System requirements: Minimum/recommended hardware (CPU, RAM, graphics card, storage) for smooth operation.
Consolidation: Reusing several commands together in the same drawing until they become second nature.
Dimensional constraint: Dimension driven by a value or formula (width = 2 × height), which redefines the geometry.
Geometric constraint: Relationship imposed between objects (parallel, perpendicular, tangent, equal, coincident…), maintained automatically.
Absolute coordinates: X,Y position measured from the drawing origin (0,0).
Relative coordinates: Movement from the last point: @dx,dy (Cartesian) or @distance<angle (polar).
Dimensioning: Indication of actual dimensions on a drawing (lengths, angles, radii, diameters).
GD&T / tolerancing: Advanced mechanical dimensioning: dimensional and geometric tolerances, fits, surface finishes.
Associative dimension: Dimension linked to geometry: it updates automatically when the object is modified.
Linear / aligned dimension: Linear: horizontal or vertical measurement. Aligned: parallel to the dimensioned object.
Break (BREAK / BR): Remove a portion of an object between two points, or split it.
Contour line / topo point: Topographic elements: terrain elevation (contour lines) and field survey points.
Create a block (BLOCK / B): Define a block from objects, with a name and an insertion point (base point).
CUI (Customize User Interface): Interface customization editor: ribbons, menus, toolbars, buttons, macros.
CAD: CAD: Computer-Aided Drafting (the drawing). CAE: Computer-Aided Engineering (design + calculations).
Offset (OFFSET / O): Create a parallel copy at a given distance: widely used for walls, contours, curves.
Move / Copy: MOVE (M): move objects. COPY (CO): duplicate them. Base point + destination.
Complete 2D drawing: A finished drawing involving precise drafting, snaps, modification and finishing.
Parametric drawing: Geometry driven by constraints and parameters, rather than fixed by coordinates.
Technical drawing: Standardized and dimensioned representation of an object or structure, used for manufacturing or construction.
DWG: Native AutoCAD file format, now a universal standard for exchanging technical drawings.
Viewport scale: Display ratio of the drawing in the viewport (1:50, 1:100…), lockable to prevent accidental changes.
Hatch scale: Pattern density; adjust so it is legible (neither too tight nor too loose) at the printing scale.
Timed practice: Complete typical exercises within a time limit to gain speed and reliability.
Line weight (when printed): Printed line thickness, used to hierarchy the drawing (bold outlines, fine details).
Workspace: Interface configuration (ribbons, palettes) adapted to a use (2D, 3D). Customizable.
Model space: Space where you draw at actual scale (1:1). The "Model" tab.
Paper space (Layout): Space for page setup for printing: title block, scaled viewports. The "Layout" tabs.
Practical exam: Test where you perform real tasks in the software (not just multiple choice), timed.
PDF export: Production of a PDF (PDF printer or EXPORTPDF) to distribute the drawing sheet.
Data extraction (DATAEXTRACTION): Automatic generation of a table/bill of materials from block attributes in the drawing.
Extrusion (EXTRUDE): Give thickness/height to a closed 2D profile to create a solid.
Layout viewport: "Window" in the sheet displaying model space at a given scale.
Base file (QNEW): The template used by default when creating a new drawing (New button).
Workflow: Logical sequence of drafting steps, from basic linework to finishing.
Template (DWT): Pre-configured model file (layers, styles, title block, units) used as a base for each new drawing.
Freeze / Turn off / Lock: Freeze: hides and declutters the display. Turn off: hides. Lock: makes visible but not editable.
Georeferencing: Positioning the drawing in a real-world geographic coordinate system.
Sheet Set Manager (SSM): Palette that centralizes, numbers, updates and publishes all sheets in a project.
Layer Properties Manager: Window to create, name and manage all layers and their states.
External References Manager (XREF): Palette to attach, detach, reload and manage the state of references.
Gradient: Color gradient fill, mainly used for presentation renders.
Grid / Snap: Grid: visual helper pattern. Snap: the cursor locks onto regular intervals.
Hatch (HATCH / H): Filling a closed area with a pattern (lines, symbols) representing a material or surface.
Text height: Text size; define in accordance with the printing scale (annotation).
Insert (INSERT / I): Place an instance of an existing block in the drawing, with scale and rotation.
Design intent: The set of desired relationships and rules, captured by constraints rather than by fixed lines.
Sheet set: Organized and named collection of sheets (layouts) for a project, managed via the SSM.
Education license: Free AutoCAD license for students and teachers (non-commercial use), with proof of eligibility.
Line (LINE / L): Straight segment between two points. Each segment is a separate object.
Command line: Input area (at the bottom) where you type commands and read AutoCAD prompts. The core of control.
Leader (MLEADER): Arrow annotation linking text to a point on the drawing (callouts, notes).
Cable list / terminal blocks: Documents automatically generated from the intelligent schematic.
Macro: Sequence of commands/actions automatically chained by a button or shortcut.
Materials / lighting: Surface properties (color, texture, reflectivity) and light sources for rendering.
Drafting method: Efficient order: draw the main lines, then detail, then clean up/finalize.
Mirror (MIRROR / MI): Create a symmetrical image of objects across an axis.
Page setup: Printing configuration for a layout: paper size, plotter, plot area, plot styles.
Hatch pattern: Repeated fill design (ANSI31 for steel, concrete, earth…), with adjustable scale and angle.
Smart wall: Wall object with thickness, composition and automatic joins, globally editable.
Bill of materials: Summary table of components and quantities, fed by block data.
Bill of materials (BOM): List of components and quantities, automatically generated and tagged.
Layer standard: Naming and property convention for layers (often according to a charter or industry standard).
Automatic numbering: Consistent assignment and updating of sheet numbers by the SSM.
Exam objectives: Official list of assessed skills, to use as a revision roadmap.
Architectural object: Parametric component (wall, door…) carrying real properties, richer than simple linework.
Boolean operations: Union (merge), Subtraction (hollow/drill), Intersection (common volume) of solids.
Orbit (ORBIT): Rotate the view around the 3D model to observe it from any angle.
Ortho: Mode constraining drafts to horizontal and vertical. Toggle with F8.
Tool palette: Customizable panel grouping blocks, hatches and frequently used commands, ready to drag and drop.
Pan: Move the view without changing the scale. Hold middle mouse button, or use PAN command (alias P).
Parameter: Named variable (often dimensional) that can be modified to adjust the entire drawing.
Parameter / Action: Elements that make a dynamic block: the parameter defines a variable, the action is the associated behavior.
Grips: Small squares appearing on a selected object, for direct editing (stretch, move, rotate).
Base point: Reference point from which movement, copying or rotation is performed.
Polyline (POLYLINE / PL): Connected sequence of segments and arcs forming ONE object: ideal for contours.
Inserted door / window: Element that anchors into a wall and automatically creates an opening, following its modifications.
Prerequisites / experience: Recommended level and practice (often several dozen/hundred hours) before taking the exam.
Extend (EXTEND / EX): Stretch an object until it meets a limiting edge.
Layer properties: Color, line type (continuous, dashed…) and weight associated with the layer, inherited by its objects.
Batch publishing: Print/PDF export of all sheets in the set in a single operation.
Fillet (FILLET / F): Connect two objects with an arc of a given radius (round), or at a sharp angle if radius = 0.
Redefine: Modify a block definition: all its instances update automatically.
Cross-reference: Automatic link between associated elements (e.g. coil and its contacts), updated together.
External reference (Xref): DWG drawing attached in another drawing, remaining a separate file, updated if the original changes.
Drawing settings: Units, precision, styles, system variables saved in the template for a consistent start.
Rendering: Generation of a realistic image of the model with materials, lights and shadows (RENDER command).
Tagging: Automatic numbering of components in an assembly, linked to the bill of materials.
Object snap tracking (Otrack): Aligns a new point with existing snap points via temporary alignment lines.
Wire tagging: Automatic numbering/identification of wires and conductors in the schematic.
Polar tracking: Guides drafting along predefined angles (0°, 30°, 45°, 90°…) with temporary alignment lines.
Array: Duplication of objects in a pattern: rectangular (rows/columns), polar (circular) or path.
Associative array: Array remaining editable (count, spacing) after creation, as long as it is associative.
Revolution (REVOLVE): Create a solid by rotating a profile around an axis (revolved parts).
Rotate / Scale: ROTATE (RO): pivot around a point. SCALE (SC): enlarge/reduce by a factor.
LISP routine (.lsp): AutoLISP program, often stored as a .lsp file, defining one or more custom commands.
Ribbon: Top bar organizing commands into tabs (Home, Insert, Annotate…) and thematic panels.
Dynamic input: Input fields that follow the cursor to enter distances and angles directly on screen.
Script (.scr): Text file of commands executed in sequence, to automate repetitive or batch tasks.
UCS (User Coordinate System): Orientable coordinate system defining the work plane in 3D space. Key to drawing on any face.
Crossing selection: Rectangle drawn from RIGHT to LEFT: selects everything it TOUCHES (dashed/green outline).
Window selection: Rectangle drawn from LEFT to RIGHT: selects objects ENTIRELY contained (solid/blue outline).
GIS (Geographic Information System): System managing localized data (maps, georeferenced objects, attributes).
3D solid: Filled volume (as opposed to surfaces/meshes), on which Boolean operations can be performed.
Underlay: Image, PDF or DWF embedded as a reference background, non-editable, used for alignment or scanned base.
Standardization: Uniformization of conventions (layers, styles, title blocks) within a team or company.
Dimension style (DIMSTYLE): Global setting for dimension appearance (arrows, text, units, tolerances…), according to a standard.
Text style: Reusable setting defining font, height and effects of text, for consistency.
Plot style CTB / STB: CTB: plot style driven by object color. STB: by named styles. Defines line weights and grayscale when printing.
Visual style: Display mode of the model: 2D wireframe, hidden, realistic, conceptual… depending on the need.
Standard electrical symbol: Standard representation of a component (contact, relay, motor…) from the libraries.
Single-line text (TEXT): One-line text, simple object. Ideal for short labels.
Multiline text (MTEXT / MT): Text paragraph with rich formatting (bold, lists, columns). The most versatile.
Toolset: Specialized version included in the subscription: Architecture, Mechanical, Electrical, Map 3D, Plant 3D…
Confirm: Confirm a command or input with Enter or the spacebar (which also replays the last command).
Viewport lock: Freezes a viewport's scale so an accidental zoom does not change it.
ViewCube: Navigation widget allowing quick switching between standard views (top, front, iso…).
Base view (BASEVIEW): 2D view automatically generated from a 3D model (top, front, iso…), placed in a layout.
Projected / section / detail view: Derived views: orthogonal projection, section cutting through the model, enlargement of an area.
Associative hatch: Hatch linked to its boundary: it updates automatically if the boundary is modified.
Zoom: Enlarge/reduce the display. Using the scroll wheel (around the cursor), or ZOOM command with its options.
Zoom extents: Display the entire drawing. Double-click the scroll wheel, or ZOOM > Extents.