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Smart Definition
Etymology
Pronunciation
efeméride
ephemeris
ephemeral
lasting for a very short time
Efeméride means ephemeris (a table of the predicted positions of celestial bodies) and is related to the English word ephemeral0 (lasting for a very short time0). Both words come from the Greek 'ephemeros', meaning 'daily', as an ephemeris gives daily positions of celestial bodies.
noun
  1. ephemeris
    A noteworthy event or date
    Hoy celebramos una importante efeméride en la historia de nuestro país. // Today we celebrate an important anniversary in our country's history.