ephemera

[ih-fem-er-uh]

Origin:
1670–80; < Greek ephḗmera, neuter plural of ephḗmeros, taken as singular; see ephemeral

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ephemeron

[ih-fem-uh-ron, -er-uhn]
noun, plural ephemera [ih-fem-er-uh] , ephemerons.
1.
anything short-lived or ephemeral.
2.
ephemera, items designed to be useful or important for only a short time, especially pamphlets, notices, tickets, etc.

Origin:
1570–80; < Greek ephḗmeron short-lived insect, noun use of neuter of ephḗmeros; see ephemeral

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ephemera (ɪˈfɛmərə)
 
n , pl -eras, -erae
1.  a mayfly, esp one of the genus Ephemera
2.  something transitory or short-lived
3.  (functioning as plural) a class of collectable items not originally intended to last for more than a short time, such as tickets, posters, postcards, or labels
4.  a plural of ephemeron
 
[C16; see ephemeral]

ephemeron (ɪˈfɛməˌrɒn)
 
n , pl -era, -erons
(usually plural) something transitory or short-lived
 
[C16: see ephemeral]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

ephemera
late 14c., originally a medical term, from M.L. ephemera (febris) "(fever) lasting a day," from fem. of ephemerus, from Gk. ephemeros "lasting only one day," from epi "on" + hemerai, dat. of hemera "day," from PIE *amer- "day." Sense extended to short-lived insects and flowers; general sense of "transitory"
is first attested 1630s.

ephemeron
1620s, from Gk. (zoon) ephemeron, neut. of ephemeros (see ephemera).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It will either confirm earlier measurements of the axis of evil or show them to
  be ephemera.
He made collages from pulpy ephemera such as starlet photographs and
  astronomical maps.
Ephemera from the museum's own collection will also be among the hundreds of
  items displayed.
By nature, a sweet sensation is more fleeting than lasting, a leap into the
  ephemera.
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