/ Dictionary / Index A air system: Meaning and Definition of Find definitions for: air' sys"tem Pronunciation: [key] a system of refrigeration utilizing air as a coolant. any group of devices operated or controlled by air under pressure or vacuum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. air switch airt 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