WATWER
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maybe I think it's "slice"
Well, if something is 2d it is flat, like the screen you are looking at right now, reading this. so 3d, is when something is practically there, and looks more realistic, pic up anything in your house that isn't paper or something as flat, and that's 3d. .don't even get me started about 4d...
something wiht three dimensoins... its not flat it has depth
Something that is not flat. A cube is three-dimensional, but a square is not. A sphere is three-dimensional, but a circle is not.