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ahemeral

British  
/ eɪ-, æˈhɛmərəl /

adjective

  1. not constituting a full 24-hour 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

Etymology

Origin of ahemeral

C20: from Greek a- not + hēmera a day

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