Pronunciation: (tOO'di-men'shu-nl, -dī-),[key] —adj. 1. having the dimensions of height and width only: a two-dimensional surface. 2. (of a work of art) having its elements organized in terms of a flat surface, esp. emphasizing the vertical and horizontal character of the picture plane: the two-dimensional structure of a painting. 3. (in a literary work) shallow, unconvincing, or superficial in execution: a novel having two-dimensional characters.