The Collaborative International Dictionary of English v.0.48:

Universe \U"ni*verse\, n. [L. universum, from universus
   universal; unus one + vertere, versum, to turn, that is,
   turned into one, combined into one whole; cf. F. univers. See
   One, and Verse.]
   All created things viewed as constituting one system or
   whole; the whole body of things, or of phenomena; the to~
   pa^n of the Greeks, the mundus of the Latins; the world;
   creation.
   [1913 Webster]

         How may I
         Adore thee, Author of this universe
         And all this good to man!                --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

universe
    n 1: everything that exists anywhere; "they study the evolution
         of the universe"; "the biggest tree in existence" [syn:
         universe, existence, creation, world, cosmos,
         macrocosm]
    2: (statistics) the entire aggregation of items from which
       samples can be drawn; "it is an estimate of the mean of the
       population" [syn: population, universe]
    3: everything stated or assumed in a given discussion [syn:
       universe, universe of discourse]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "universe":
   Anschauung, angle, angle of vision, bailiwick, basis, circle,
   corner, cosmos, creation, domain, eye, footing, frame of reference,
   framework, light, macrocosm, macrocosmos, megacosm, mental outlook,
   microcosm, milieu, nature, outlook, place, point of view, position,
   province, quarter, reference system, regard, respect, side, sight,
   situation, slant, sphere, stand, standpoint, system, territory,
   view, viewpoint, world