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Meaning of fortition

for•ti•tion

Pronunciation: (fôr-tish'un), [key]
— n.
  1. a phonological process that strengthens consonant articulation at the beginnings of syllables, causing devoicing or the formation of stops.
  2. a type of Celtic mutation that derives historically from phonological fortition.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.