/ Dictionary / Index A air letter: Meaning and Definition of Find definitions for: air' let"ter Pronunciation: [key] an airmail letter. a sheet of very lightweight stationery for use in airmail. Cf. aérogramme. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. airless airlift Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language