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Meaning of glosseme

glos•seme

Pronunciation: (glos'ēm, glô'sēm), [key]
— n. Ling.
  1. (in glossematics) an irreducible, invariant form, as a morpheme or tagmeme, that functions as the smallest meaningful unit of linguistic signaling.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.