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American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. either the female or male division of a species, esp. as differentiated with reference to the reproductive functions.
2. the sum of the structural and functional differences by which the female and male are distinguished.
3. the instinct or attraction drawing one individual sexually toward another, or the cultural phenomena, behavior, or activities that it motivates.
6. to ascertain the sex of, esp. of newly hatched chicks.
7. to arouse sexually (often fol. by up).Idioms:
have sex, to engage in sexual relations, esp. sexual intercourse.
[1350–1400; Middle English < Latin sexus]
a combining form meaning “six”: sexdecillion.
[< Latin, comb. form of sex six]
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