Source : Webster's Revised Unabridged Dictionary (1913)

Coalition \Co`a*li"tion\, n. [LL. coalitio: cf. F. coalition.
   See {Coalesce}.]
   1. The act of coalescing; union into a body or mass, as of
      separate bodies or parts; as, a coalition of atoms.
      --Bentley.

Source : WordNet®

coalition
     n 1: an organization of people (or countries) involved in a pact
          or treaty [syn: {alliance}, {alignment}, {alinement}]
          [ant: {nonalignment}]
     2: the state of being combined into one body [syn: {fusion}]
     3: the union of diverse things into one body or form or group;
        the growing together of parts [syn: {coalescence}, {coalescency},
         {concretion}, {conglutination}]