The Collaborative International Dictionary of English v.0.48:

Ubiquitous \U*biq"ui*tous\ ([-u]*b[i^]k"w[i^]*t[u^]s), a. [See
   Ubiquity.]
   Existing or being everywhere, or in all places, at the same
   time; omnipresent. -- U*biq"ui*tous*ly, adv.
   [1913 Webster]

         In this sense is he ubiquitous.          --R. D.
                                                  Hitchcock.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ubiquitous
    adj 1: being present everywhere at once [syn: omnipresent,
           ubiquitous]

Moby Thesaurus II by Grady Ward, 1.0:

121 Moby Thesaurus words for "ubiquitous":
   absolute, all-embracing, all-encompassing, all-knowing, all-out,
   all-pervading, all-powerful, all-present, all-seeing, all-wise,
   almighty, bizarre, born, boundless, broad-based, changeless, clean,
   clear, comprehensive, congenital, consummate, continuous, creating,
   creative, cyclical, deep-dyed, downright, dyed-in-the-wool,
   egregious, eternal, eternally the same, ever-recurring,
   everlasting, everywhere, exhaustive, frequent, glorious, good,
   grotesque, hallowed, haunting, hideous, highest, holy, homely,
   ill-favored, ill-looking, immortal, immutable, incessant, infinite,
   intensive, just, limitless, loving, luminous, majestic, making,
   merciful, numinous, omnibus, omnipotent, omnipresent, omniscient,
   one, out-and-out, outright, perfect, periodic, permanent,
   perpetual, pervasive, plain, plumb, pure, radiant, radical,
   reappearing, recurrent, recurring, regular, repelling, repugnant,
   repulsive, returning, revenant, sacred, shaping, sheer, sovereign,
   straight, supreme, surly, sweeping, thematic, thick-coming,
   thorough, thoroughgoing, through-and-through, timeless, total,
   unattractive, unbeautiful, unbounded, unchanging, uncomely,
   unconditional, undefined, uninviting, universal, unlimited,
   unmitigated, unpleasing, unprepossessing, unqualified, unreserved,
   unrestricted, unsightly, utter, veritable, wholesale