noun, plural moieties.
a half.
an indefinite portion, part, or share.
Anthropology. one of two units into which a tribe or community is divided on the basis of unilineal descent.

1400–50; late Middle English moite < Middle French < Latin medietāt- (stem of medietās) the middle, equivalent to medi(us) mid + -etāt-, variant, after vowels, of -itāt- -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
moiety (ˈmɔɪɪtɪ)
n , pl -ties
1.  a half
2.  one of two parts or divisions of something
[C15: from Old French moitié, from Latin mediētās middle, from medius]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1444, from O.Fr. meitiet, from L. medietas "half," from medius "middle" (see medial).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

moiety moi·e·ty (moi'ĭ-tē)
One of two or more parts into which something may be divided, such as the various parts of a vitamin or molecule.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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