WordReference Random House Learner's Dictionary of American English © 2020
ˈjet ˌlag or  ˈjetˌlag, n. [uncountable]
  • Pathologya feeling of fatigue or confusion when the body's normal biological rhythms have been affected after a long flight through several time zones.

  • WordReference Random House Unabridged Dictionary of American English © 2020
    jet lag′, 
  • Pathologya temporary disruption of the body's normal biological rhythms after high-speed air travel through several time zones. Also,  jetlag′. 
  • jet-lagged′, adj. 
    • 1965–70

    Collins Concise English Dictionary © HarperCollins Publishers::
    jet lag n
    1. a general feeling of fatigue and disorientation often experienced by travellers by jet aircraft who cross several time zones in relatively few hours
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