This might mean two-dimensional.
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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.
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.
3D means that the picture or movie has depth. Like, it looks like the picture is jumping out at you. 2D is like a drawing on a piece of paper. It has no depth.