Webster's English Dictionary

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domain

Cross references:
  1. eminent domain        
 
do.main \do--'ma-n, d*-\ n [MF domaine, demaine, fr. L dominium, fr. 
   dominus] 1a: complete and absolute ownership of land  1b: land so owned  2: 
   a territory over which dominion is exercised  3: a sphere of influence or 
   activity  4: the set of elements to which a mathematical or logical 
   variable is limit ed; specif : the set on which a function is defined