The Collaborative International Dictionary of English v.0.48:

Praxis \Prax"is\, n. [NL., fr. Gr. ?, fr. ? to do. See
   Practice.]
   1. Use; practice; especially, exercise or discipline for a
      specific purpose or object. "The praxis and theory of
      music." --Wood.
      [1913 Webster]

   2. An example or form of exercise, or a collection of such
      examples, for practice.
      [1913 Webster]

WordNet (r) 3.0 (2006):

praxis
    n 1: translating an idea into action; "a hard theory to put into
         practice"; "differences between theory and praxis of
         communism" [syn: practice, praxis]

Moby Thesaurus II by Grady Ward, 1.0:

104 Moby Thesaurus words for "praxis":
   act, acting, action, actions, activism, activity, acts, address,
   affectation, air, automatism, bad habit, bearing, behavior,
   behavior pattern, behavioral norm, behavioral science, bon ton,
   carriage, characteristic, comportment, conduct, conformity,
   consuetude, convention, creature of habit, culture pattern, custom,
   demeanor, deportment, doing, doings, employment, established way,
   etiquette, exercise, fashion, folkway, force of habit, function,
   functioning, gestures, goings-on, guise, habit, habit pattern,
   habitude, maintien, manner, manners, method, methodology, methods,
   mien, modus vivendi, mores, motions, movements, moves,
   observable behavior, observance, occupation, operation, operations,
   pattern, peculiarity, play, poise, port, pose, posture, practice,
   prescription, presence, procedure, proceeding, proper thing,
   ritual, second nature, social convention, social science,
   standard behavior, standard usage, standing custom, stereotype,
   stereotyped behavior, style, swing, tactics, time-honored practice,
   tone, tradition, trick, usage, use, way, way of life, ways,
   what is done, wont, wonting, work, working, workings