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Meaning of one-many

one-man•y

Pronunciation: (wun'men'ē usually read as wun't&schwa&sylpmen'ē), [key]
— adj. Logic, Math.
  1. (of a relation) having the property that an element may be assigned to several elements but that given an element, only one may be assigned to it.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.