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Model (in CAD) precise term for the data managed by a CAD system to represent the parts. It is the virtual model of the designed part.

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FEM Finite Element. type of software made to compute and simulate the reaction of CAD models in respect of stress, magnetism, plastic injection etc..

Configuration (in CAD)

CADCAM Computer Aid Design. A software for design of mechanical and architecture. It will usually allow some drafting in 2D and 3D modeling capabilities.