2D CAD = two dimensional computer aided drafting.
2D CAD is like drafting on paper on a drafting board. 2D CAD is a old way of doing CAD. Nowdays, The new way is three dimensional CAD.
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it would be desighning something in a 2d plane.. such as drwaing on a peeice of paper or desighning with a 2d programing. as long as your not modeling in 3d using auto cad maya or another 3d desighner its 2d desighn.
This might mean two-dimensional.
Dimension.
It means 2d whereas 3d means three dimensional
2d means 2 dimensional or flat figures. If you are dealing with algebra or graphing, it would mean X and Y coordinates only, not Z.