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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Halation  \Ha*la"tion\  (h[asl]*l[=a]"sh[u^]n),  n.  (Photog.) 
  An  appearance  as  of  a  halo  of  light,  surrounding  the  edges  of 
  dark  objects  in  a  photographic  picture.