/ Dictionary / Index L light machine gun: Meaning and Definition of Find definitions for: light' machine' gun" Pronunciation: [key] — Mil. Mil. any air-cooled machine gun having a caliber not greater than 0.30 in. (7.6 mm). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lightly light meat Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language