English Reference
adjective · noun

ephemeral

adj. · n.
US /ɪˈfɛmɝəɫ/ UK /ɪfˈɛməɹəl/ ephemer·al

  1. 01 C1 Advanced AcademicLiterary

    adj.lasting for a very short time.

    adj.lasting for a very brief period; transient or fleeting in nature.

    Simple

    The joy of the victory was ephemeral, as the team lost their next game just two days later.

    In context

    The artist sought to capture the ephemeral beauty of the morning mist before the rising sun burned it away entirely.

    Teacher's tip

    This is a sophisticated word often used in essays or literature to describe feelings, fame, or natural beauty.

  2. 02 C2 Proficiency Technical Science

    adj.living for only one day, or a stream that only has water after it rains.

    adj.existing for a very brief duration, such as organisms with a one-day life cycle or watercourses that flow only after precipitation.

    Simple

    After the heavy desert rain, ephemeral flowers suddenly covered the sand.

    In context

    The ecosystem relies on ephemeral streams that appear only during the monsoon season to provide vital hydration to local wildlife.

    Usage

    In biology, it specifically describes organisms like mayflies; in geology, it describes seasonal or rain-dependent water.

    short livedtemporary
  3. 03 C2 Proficiency FormalTechnical

    n.things that are important or useful for only a short time, like old bus tickets or posters.

    n.items of transitory interest or use, typically printed materials like posters or tickets not intended to be kept.

    Simple

    The museum has a collection of Victorian ephemeral, including old theater programs and advertisements.

    In context

    Historians often study ephemeral to understand the daily lives and social habits of people from previous centuries.

    Usage

    Often used as a collective noun in the context of collecting or historical archives.

    Teacher's tip

    In this sense, it is often used by librarians or historians to talk about paper items that were meant to be thrown away.

It also might dilute the ephemeral magic of live theater, where part of the point is that sometimes-invisible interaction between performer and audience.

The Guardian· 13 Aug 2026

Another priority is uncovering what ads teens see in their ephemeral social media feeds; digital platforms make money from highly personalized advertising , sometimes delivered via influencers.

Smithsonian Magazine· 17 Aug 2026

From New Latin ephemerus, from Ancient Greek ἐφήμερος (ephḗmeros), the more common form of ἐφημέριος (ephēmérios, “of, for, or during the day, living or lasting but for a day, short-lived, temporary”), from ἐπί (epí, “on”) + ἡμέρα (hēméra, “day”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Ancient Greek ἐφήμερος
Level C1 · Advanced
Frequency Occasional
Updated