/ Dictionary / Index F first offender: Meaning and Definition of Find definitions for: first' offend'er Pronunciation: [key] a person convicted of an offense of law for the first time. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. firstnighter first officer Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language