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Meaning of lemmatize

lem•ma•tize

Pronunciation: (lem'u-tīz"), [key]
— -tized, -tiz•ing.
  1. to sort (the words in a list or text) in order to determine the headword, under which other words are then listed.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.