Definition of two-dimensional adjective from the Oxford Advanced Learner's Dictionary

 

two-dimensional

 adjective
adjective
BrE
 
; NAmE
 
 
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flat; having no depth; appearing to have only two dimensions a two-dimensional drawing (figurative) The novel was criticized for its two-dimensional characters (= that did not seem like real people).
See the Oxford Advanced American Dictionary entry: two-dimensional