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ephemeral

/ɛˈfɛ.mə.ɹəl/EnglishC2

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ephemeral1 adjective

  1. Lasting for a short period of time; not permanent.

    In other words: transient, momentary, passing

    • Her interest in the hobby was ephemeral, fading after a few weeks.
  2. Existing for only one day, as with some flowers, insects, and diseases.

    In other words: short-lived, one-day, transitory

    • The mayfly is an ephemeral insect, living only a single day as an adult.
  3. Usually dry, but filling with water for brief periods during and after precipitation.

    In other words: seasonal, intermittent, temporary

    • The desert has many ephemeral streams that flow only after heavy rains.

ephemeral2 noun

  1. Something which lasts for a short period of time; a transient thing.

    In other words: transient, fleeting thing

    • The artwork was an ephemeral, meant to be enjoyed only for a moment.