Source : Webster's Revised Unabridged Dictionary (1913)

Lawsuit \Law"suit`\, n.
   An action at law; a suit in equity or admiralty; any legal
   proceeding before a court for the enforcement of a claim.

Source : WordNet®

lawsuit
     n : a comprehensive term for any proceeding in a court of law
         whereby an individual seeks a legal remedy; "the family
         brought suit against the landlord" [syn: {suit}, {case},
         {cause}, {causa}]