from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Lasting for a markedly brief time: "There remain some truths too ephemeral to be captured in the cold pages of a court transcript” ( Irving R. Kaufman).
- adj. Living or lasting only for a day, as certain plants or insects do.
- n. A markedly short-lived thing.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Something which lasts for a short period of time.
- adj. Lasting for a short period of time.
- adj. Existing for only one day, as with some flowers, insects, and diseases.
- adj. Usually dry, but filling with water for brief periods during and after precipitation.
from the GNU version of the Collaborative International Dictionary of English
- adj. Beginning and ending in a day; existing only, or no longer than, a day; diurnal.
- adj. Short-lived; existing or continuing for a short time only.
- n. Anything lasting but a day, or a brief time; an ephemeral plant, insect, etc.
from The Century Dictionary and Cyclopedia
- In zoology, lasting but one day; ephemeric; ephemerous.
- Hence Existing or continuing for a very short time only; short-lived; transitory.
- Also, rarely, ephemeric.
- Synonyms Transient, fleeting, evanescent.
- n. Anything which lasts or lives but for a day or for a very short time, as certain insects.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. anything short-lived, as an insect that lives only for a day in its winged form
- adj. lasting a very short time
From Greek ephēmeros : ep-, epi-, epi- + hēmerā, day.(American Heritage® Dictionary of the English Language, Fourth Edition)
From New Latin ephemerus, from Ancient Greek ἐφήμερος (ephēmeros), the more common form of ἐφημέριος (ephemerios, "of, for, or during the day, living or lasting but for a day, short-lived, temporary"), from ἐπί (epi, "on") + ἡμέρα (hēmera, "day"). (Wiktionary)