/ Dictionary / Index F Fort Irwin: Meaning and Definition of Find definitions for: Fort" Ir'win Pronunciation: [key] a military reservation in SW California, NE of Barstow. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Fortin barometer fortis Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language