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CAD stands for any of

Computer-aided design
Computer-aided drafting
Computer-aided drawing

and it may also be found as CADD referring to drafting and design. The acronym CAD may be coupled with CAM as in CAD/CAM), which stands for any of

Computer-aided modeling (or solid modeling)
Computer-aided manufacturing

and can be coupled with computer-aided analysis and Computer Numeric Control CNC.

The entire process is called computer-aided engineering (CAE).

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