/ Dictionary / Index L lifer: Meaning and Definition of Find definitions for: lif•er Pronunciation: (lī'fur), [key] — n. Slang. a person sentenced to or serving a term of life imprisonment. a person committed to a professional lifetime career in the military. a person who has devoted a lifetime to a profession, occupation, or pursuit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lifer (Thesaurus) life preserver life raft Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language