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half-

prefix
1.
one of two equal parts: half-moon
2.
related by one parent only: half-sister
3.
not completely; partly: half-hardy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for half-

"sharing one parent," from half. Half-brother is attested from early 14c.; half-sister from c.1200.

Online Etymology Dictionary, © 2010 Douglas Harper
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Word Value for half

10
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