/ Dictionary / Index F field jacket: Meaning and Definition of Find definitions for: field' jack"et Pronunciation: [key] a close-fitting jacket for wear by soldiers in the field. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. field-ion microscope field lark Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language