Webster's English Dictionary

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squadron

squad.ron \'skwa:d-r*n\ n [It squadrone, aug. of squadra squad] : a unit of 
   military organization :  : a calvary unit higher than a troop and lower 
   than a regiment  : a naval unit consisting of two or more divisions and 
   sometimes addition al vessels : a unit of the U.S. Air Force higher than a 
   flight and lower than a gro up : a military flight formation