n.
Pronunciation: i- ' fe-m ə r- ə , - ' fem-r ə
Function: noun
Inflected Form: plural ephemera also ephem · er · ae \ -m ə r- ē , -r ē \ or ephemeras
Etymology: New Latin, from Greek eph ē mera, neuter plural of eph ē meros
Date: 1650
1 : something of no lasting significance ― usually used in plural
2 ephemera plural : paper items (as posters, broadsides, and tickets) that were orig. meant to be discarded after use but have since become collectibles