# Glossary

## A

affinity An operation in which an element is transformed by applying X, Y, Z affinity ratios with respect to a reference axis system.

## C

child A status defining the hierarchical relation between a feature or element and another feature or element.
constraint A geometric or dimension relation between two elements.

## E

extrapolate An operation in which an element is extended a specified amount while respecting tangency or curvature conditions. Typically a surface boundary can be selected for in order to extrapolate the surface a specified length.
extruded surface A surface that is obtained by extruding a profile along a specified direction.

## F

feature A component of a part.
fill surface A surface that is obtained by filling a closed boundary that is made up from a number of segments.
fillet A curved surface of a constant or variable radius that is tangent to and  joins two surfaces. Together these three surfaces form either an inner or outer corner.

## G

geometrical feature set A geometrical set, an ordered geometrical set, a solid body or an hybrid body.
guiding curve A curve, intersecting with a profile, and along which this profile is swept. See also spine.

## J

join An operation in which adjacent curves or adjacent curves can be assembled to make up one element.

## M

multi-section surface A surface that is obtained by sweeping two or more planar section curves along a spine, which may be automatically computed or user-defined. The surface can be made to follow one or more guide curves.

## O

offset surface A surface that is obtained by offsetting an existing surface a specified distance.

## P

parent A status defining the hierarchical relation between a feature or element and another feature or element.
part A 3D entity obtained by combining different features. It is the content of a CATPart document.
part body A component of a part made of one or several features.
profile An open or closed shape including arcs and lines.

## R

revolution surface A surface that is obtained by revolving a profile around an axis.
rotate An operation in which an element is rotated by a specified angle about an given axis.

## S

scaling An operation that resizes an element to a percentage of its initial size.
sketch A set of geometric elements created in the Sketcher workbench. For instance, a sketch may include a profile, construction lines and points.
spine A curve which normal planes are used to position a profile when creating a surface (lofted or swept surface for example). The profile does not necessarily intersect with this spine. See also guiding curve.
split An operation in which one element is cut by another element.
swept surface A surface obtained by sweeping a profile in planes normal to a spine curve while taking other user-defined parameters (such as guide curves and reference elements) into account.
symmetry An operation in which an element is transformed by means of a mirror symmetry with respect to a reference plane, line or point.

## T

translate An operation in which an element is displaced a specified distance along a given direction.
trim An operation in which two element cut each other mutually.

## W

wireframe element Elements such as points, lines or curves that can be used to represent the outline of a 3D object.