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definitions

ahemeral

adjective
  1. not constituting a full 24-hour day

Word Origin for ahemeral

C20: from Greek a- not + hēmera a day
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012