Definition of two-dimensional
1 : of, relating to, or having two dimensions The most symmetric of the two-dimensional objects is the circle, because you can rotate it any amount and reflect it over any axis through its center, and it remains exactly the same …— Tamara M. Davis … consider a piece of paper, a two-dimensional object. Crumple the paper up. The more tightly it's compressed, the more chaotic are its folds, and the closer the two-dimensional surface moves to becoming a three-dimensional solid.— John Briggs and F. David Peat
2 : lacking the illusion of depth : not three-dimensional His violent, nakedly two-dimensional art can be difficult to capture in photographs, depending as it does in great measure on knotty textures and eccentric color schemes for effect. — Publishers Weekly
3 : lacking depth of characterization two-dimensional characters
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