/ Dictionary / Index J jet lag: Meaning and Definition of Find definitions for: jet' lag" Pronunciation: [key] a temporary disruption of the body's normal biological rhythms after high-speed air travel through several time zones. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Jethro jetliner Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language