Expiration is what happens when a lease or contract — or a period of time — has ended. The expiration of your library card means you need to sign up for a new one.

You might notice that your container of yogurt is marked with a date — it's the expiration date, or the day the product is no longer fresh enough to be sold or eaten. Other things with expiration dates include magazine subscriptions, rental agreements, and drivers' licenses. All of these are a sort of contract that eventually ends, or expires. When you breathe out, that's technically also expiration, from the Latin expirare, "breathe out," or "breathe one's last breath."

Definitions of expiration
  1. noun
    a coming to an end of a contract period
    synonyms: expiry, termination
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    type of:
    end, ending
    the point in time at which something ends
  2. noun
    euphemistic expressions for death
    synonyms: departure, exit, going, loss, passing, release
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    type of:
    death, decease, demise, expiry
    the event of dying or departure from life
  3. noun
    the act of expelling air from the lungs
    synonyms: breathing out, exhalation
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    huffing, puffing, snorting
    an act of forcible exhalation
    blow, puff
    forceful exhalation through the nose or mouth
    an act of blowing or breathing on or into something
    type of:
    the process of taking in and expelling air during breathing
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