The Collaborative International Dictionary of English v.0.48:

Litigation \Lit`i*ga"tion\, n. [L. litigatio, fr. litigare to
   dispute, litigate; lis, litis, dispute, lawsuit (OL. stlis) +
   agere to carry on. See Agent.]
   The act or process of litigating; a suit at law; a judicial
   contest.
   [1913 Webster]

The Devil's Dictionary (1881-1906):

LITIGATION, n.  A machine which you go into as a pig and come out of
as a sausage.


Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "litigation":
   Kilkenny cats, action, altercation, apologetics, apologia, apology,
   argument, argumentation, bicker, bickering, case, casuistry,
   cat-and-dog life, cause, cause in court, combat, conflict,
   contention, contentiousness, contest, contestation, controversy,
   cut and thrust, debate, defense, disputation, dispute, enmity,
   fighting, flyting, hassle, hostility, hubbub, judicial process,
   lawsuit, legal action, legal case, legal proceedings,
   legal process, legal remedy, logomachy, paper war, passage of arms,
   polemic, polemics, proceedings, prosecution, quarrel, quarreling,
   quarrelsomeness, rhubarb, scrapping, set-to, squabbling, strife,
   struggle, suit, suit at law, verbal engagement, war, war of words,
   warfare, words, wrangling