a-
I
 /ə/  prefix  
  1 : on : in : at
   abed
  2 : in (such) a state or condition
   afire
  3 : in (such) a manner
   aloud
  4 old-fashioned : in the act or process of
   gone a-hunting [=gone hunting]
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II
 ( or   an-)  prefix  
  : not : without
   asexual