The Collaborative International Dictionary of English v.0.48:

Unite \U*nite"\, a. [L. unitus, p. p. See Unite, v. t.]
   United; joint; as, unite consent. [Obs.] --J. Webster.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unite \U*nite"\, v. t. [imp. & p. p. United; p. pr. & vb. n.
   Uniting.] [L. unitus, p. p. of unire to unite, from unus
   one. See One.]
   1. To put together so as to make one; to join, as two or more
      constituents, to form a whole; to combine; to connect; to
      join; to cause to adhere; as, to unite bricks by mortar;
      to unite iron bars by welding; to unite two armies.
      [1913 Webster]

   2. Hence, to join by a legal or moral bond, as families by
      marriage, nations by treaty, men by opinions; to join in
      interest, affection, fellowship, or the like; to cause to
      agree; to harmonize; to associate; to attach.
      [1913 Webster]

            Under his great vicegerent reign abide,
            United as one individual soul.        --Milton.
      [1913 Webster]

            The king proposed nothing more than to unite his
            kingdom in one form of worship.       --Clarendon.
      [1913 Webster]

   Syn: To add; join; annex; attach. See Add.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unite \U*nite"\, v. i.
   1. To become one; to be cemented or consolidated; to combine,
      as by adhesion or mixture; to coalesce; to grow together.
      [1913 Webster]

   2. To join in an act; to concur; to act in concert; as, all
      parties united in signing the petition.
      [1913 Webster]

WordNet (r) 3.0 (2006):

unite
    v 1: act in concert or unite in a common purpose or belief [syn:
         unite, unify] [ant: carve up, dissever, divide,
         separate, split, split up]
    2: become one; "Germany unified officially in 1990"; "the cells
       merge" [syn: unify, unite, merge] [ant: break apart,
       disunify]
    3: have or possess in combination; "she unites charm with a good
       business sense" [syn: unite, combine]
    4: be or become joined or united or linked; "The two streets
       connect to become a highway"; "Our paths joined"; "The
       travelers linked up again at the airport" [syn: connect,
       link, link up, join, unite]
    5: bring together for a common purpose or action or ideology or
       in a shared situation; "the Democratic Patry platform united
       several splinter groups" [syn: unite, unify]
    6: join or combine; "We merged our resources" [syn: unite,
       unify, merge]

Moby Thesaurus II by Grady Ward, 1.0:

208 Moby Thesaurus words for "unite":
   accord, accouple, accumulate, act in concert, act together, add,
   adhere, affiliate, agglutinate, agree, ally, amalgamate, amass,
   approach, arrange a match, articulate, assemble, assimilate,
   associate, band, band together, be in cahoots, be in league, blend,
   bond, bracket, bridge, bridge over, bunch, bunch up, cement,
   center, centralize, chain, clap together, clinch, close, close in,
   close up, close with, clot, club together, cluster, coact,
   coadunate, coalesce, cohere, coincide, collaborate, collect,
   collude, combine, come together, commingle, communicate, compound,
   comprise, concatenate, concenter, concentralize, concentrate,
   concert, concord, concur, confederate, conglobulate, congregate,
   conjoin, conjugate, connect, connive, consolidate, conspire,
   constitute a whole, converge, cooperate, copulate, correspond,
   couple, cover, crowd, date, do business with, draw together,
   embody, embrace, encompass, fall in with, federate, flock together,
   flow together, flux, forgather, form a unity, funnel, fuse,
   gang around, gang up, gather, gather around, get heads together,
   get together, give away, glue, go partners, grow together,
   hang together, happen together, harmonize, herd together, hitch,
   hive, hold together, hook up, hook up with, horde, huddle,
   identify, include, incorporate, integrate, interblend,
   intercommunicate, interfuse, intermix, intersect, join,
   join forces, join in, join together, keep together, knit, knot,
   lay together, league, league together, link, lump together,
   make a match, make a whole, make common cause, make one, marry,
   marshal, mass, match, meet, meld, melt into one, merge, mill,
   mingle, mix, mobilize, muster, narrow the gap, nip, nuptial, pair,
   partner, piece together, pinch, play ball, pull together,
   put heads together, put together, rally, rally around, reciprocate,
   reduce to unity, reembody, relate, rendezvous, roll into one,
   run together, seethe, shade into, solder, solidify, span, splice,
   stand together, stick together, stream, surge, swarm, synchronize,
   syncretize, syndicate, synergize, synthesize, take in, tape, taper,
   team up, throng, throw in together, throw in with, tie, tie in,
   tie up, unify, unite efforts, unite in marriage, wed, weld,
   work together, yoke



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

UNITE
       Ubiquitous aNd Integrated Teamwork Environment (SIT)