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