Definition of "two-dimensional" []

• Having only two dimensions, especially length and width. (adjective)
• Lacking the requisite or expected range or depth: a movie with two-dimensional characters. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "With that, I humbly extend my deepest apologies — to you, Mr. Eric Theodore Cartman — for deigning to compare the one-dimensional folk we're besieged with in reality to the much more emotionally complex and two-dimensional ... you."
• "Is it wrong to compare these flesh-and-blood people to a two-dimensional cartoon character?"
• "While the entertainment world goes mad for 3D, science is abuzz with the vast potential of this purely two-dimensional matter: it is 100 times stronger than steel, conducts electricity better than copper, and might one day displace silicon from the chip."