Webster's English Dictionary

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unit

unit \'yu:-n*t\ n [back-formation fr. unity] 1a1: the first and least 
   natural number : ONE  1a2: a single quantity regarded as a whole in 
   calculation  1b: the number occupying the position immediately to the left 
   of the decima l point in the Arabic system of numerals 2: a determinate 
   quantity (as of length, time, heat, value, or housing) ado pted as a 
   standard of measurement : as 2a: an amount of work (as 120 hours in a 
   completed course) used in educatio n in calculating student credits 2b: an 
   amount of a biologically active agent (as a drug or antigen) require d to 
   produce a specific result under strictly controlled conditions 3a: a single 
   thing or person or group that is a constituent of a whole  3b: a part of a 
   military establishment that has a prescribed organization s erving to 
   perform one particular function 3d: a part of a school course focusing on a 
   central theme and making use of  resources from numerous subject areas and 
   the pupils' own experience - unit aj