WordWeb Online

1. Having the indivisible character of a unit
   "a unitary action";
   - one
    
2. Relating to or characterized by or aiming toward unity
   "the unitary principles of nationalism"; "a unitary movement in politics"
    
3. Of or pertaining to or involving the use of units
   "a unitary method was applied"; "established a unitary distance on which to base subsequent calculations"
    
4. (government) characterized by or constituting a form of government in which power is held by one central authority
   "a unitary as opposed to a federal form of government"

See also: united

Antonym: federal

Encyclopedia: Unitary