Words at Play : Simple But Intelligent Word Choices, Vol. 2
Definition:
a division into two mutually exclusive or contradictory groups or things
Words It Might Replace:
split, division, contrast
Example:
"But ballet, with its built-in dichotomy of gender roles (women alone rise on point, men alone may do the partnering), has a romantic tension that can seem poignant, even tragic." Alastair Macaulay, New York Times, July 4, 2011