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clearance

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clearance


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Clearance  \Clear"ance\  (-ans),  n. 
  1.  The  act  of  clearing;  as  to  make  a  thorough  clearance. 
 
  2.  A  certificate  that  a  ship  or  vessel  has  been  cleared  at 
  the  customhouse;  permission  to  sail. 
 
  Every  ship  was  subject  to  seizure  for  want  of 
  stamped  clearances.  --Durke 
 
  3.  Clear  or  net  profit.  --Trollope. 
 
  4.  (Mach.)  The  distance  by  which  one  object  clears  another, 
  as  the  distance  between  the  piston  and  cylinder  head  at 
  the  end  of  a  stroke  in  a  steam  engine,  or  the  least 
  distance  between  the  point  of  a  cogwheel  tooth  and  the 
  bottom  of  a  space  between  teeth  of  a  wheel  with  which  it 
  engages. 
 
  {Clearance  space}  (Steam  engine),  the  space  inclosed  in  one 
  end  of  the  cylinder,  between  the  valve  or  valves  and  the 
  piston,  at  the  beginning  of  a  stroke;  waste  room  It 
  includes  the  space  caused  by  the  piston's  clearance  and 
  the  space  in  ports,  passageways,  etc  Its  volume  is  often 
  expressed  as  a  certain  proportion  of  the  volume  swept  by 
  the  piston  in  a  single  stroke. 
 
  From  WordNet  r  1.6  [wn]: 
 
  clearance 
  n  1:  the  distance  by  which  one  thing  clears  another;  the  space 
  between  them 
  2:  vertical  space  available  to  allow  easy  passage  under 
  something  [syn:  {headroom},  {headway}] 
  3:  permission  to  proceed;  "the  plane  was  given  clearance  to 
  land" 




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