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Adjective: two-party  'too'paa(r)-tee or 'too,paa(r)-tee
  1. Supported by both sides
    "a two-party treaty";
    - bipartisan
     
  2. Involving or dominated by two major political parties
    "The US has a two-party political system"

See also: nonpartisan, nonpartizan [rare]

Encyclopedia: Two-party