English

Definition of ephemera noun from the Oxford Advanced Learner's Dictionary

 

ephemera

 noun
noun
BrE BrE//ɪˈfemərə//
 
; NAmE NAmE//ɪˈfemərə//
 
[plural]
 
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things that are important or used for only a short period of time a collection of postcards, tickets and other ephemera Word Origin late 16th cent.: plural of ephemeron, from Greek, neuter of ephēmeros ‘lasting only a day’. As a singular noun the word originally denoted a plant said by ancient writers to last only one day, or an insect with a short lifespan, and hence was applied (late 18th cent.) to a person or thing of short-lived interest. Current use has been influenced by plurals such as trivia and memorabilia.
See the Oxford Advanced American Dictionary entry: ephemera