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Division into two usually contradictory parts or opinions: "the dichotomy of the one and the many” ( Louis Auchincloss).
(noun)
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Astronomy The phase of the moon, Mercury, or Venus when half of the disk is illuminated.
(noun)
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Botany Branching characterized by successive forking into two approximately equal divisions.
(noun)
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.