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Definition: 1. of, having, or relating to two dimensions, usually describable in terms of length and breadth or length and height. 2. lying on a plane; having an area but not enclosing any volume. 3. lacking in depth, as characters in a literary work. 4. (of painting or drawing) lacking the characteristics of form or depth.
Source: Collins English Dictionary. London: Collins, 2000. Credo Reference. Web. 29 August 2012.