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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Key  \Key\,  v.  t.  [imp.  &  p.  p.  {Keved};  p.  pr  &  vb  n. 
  To  fasten  or  secure  firmly;  to  fasten  or  tighten  with  keys  or 
  wedges.  --Francis. 
  {To  key  up}. 
  a  (Arch.)  To  raise  (the  whole  ring  of  an  arch)  off  its 
  centering,  by  driving  in  the  keystone  forcibly. 
  b  (Mus.)  To  raise  the  pitch  of 
  c  Hence  fig.,  to  produce  nervous  tension  in