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Meaning of many-one

man•y-one

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