Webster's English Dictionary

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takeoff

take.off \'ta--.ko.f\ n often attrib  1: an imitation esp. in the way of 
   caricature  2a: a rise or leap from a surface in making a jump or flight or 
   an ascent i n an aircraft or in the launching of a rocket 2b: an action of 
   starting out or setting out  3a: a spot at which one takes off  3b: a 
   starting point : point of departure  4: an action of removing something  5: 
   the action of estimating or measuring an amount of material needed  6: a 
   mechanism for transmission of the power of an engine or vehicle to ope rate 
   some other mechanism