The Collaborative International Dictionary of English v.0.48:

Incorporation \In*cor`po*ra"tion\, n. [L. incorporatio: cf. F.
   incorporation.]
   [1913 Webster]
   1. The act of incorporating, or the state of being
      incorporated.
      [1913 Webster]

   2. The union of different ingredients in one mass; mixture;
      combination; synthesis.
      [1913 Webster]

   3. The union of something with a body already existing;
      association; intimate union; assimilation; as, the
      incorporation of conquered countries into the Roman
      republic.
      [1913 Webster]

   4. (Law)
      (a) The act of creating a corporation.
      (b) A body incorporated; a corporation.
          [1913 Webster]

WordNet (r) 3.0 (2006):

incorporation
    n 1: consolidating two or more things; union in (or into) one
         body
    2: learning (of values or attitudes etc.) that is incorporated
       within yourself [syn: internalization, internalisation,
       incorporation]
    3: including by incorporating

Moby Thesaurus II by Grady Ward, 1.0:

125 Moby Thesaurus words for "incorporation":
   Anschluss, addition, admissibility, admission, affiliation,
   agglomeration, aggregation, agreement, alignment, alliance,
   amalgamation, assemblage, assembly, assimilation, association,
   blend, blending, building, buildup, cabal, cahoots, cartel,
   centralization, coadunation, coalescence, coalition, colleagueship,
   collegialism, collegiality, combination, combine, combo,
   completeness, composition, compound, comprehension,
   comprehensiveness, comprisal, comradeship, confederacy,
   confederation, confraternity, congeries, conglomeration,
   conjugation, conjunction, consolidation, conspiracy, constitution,
   construction, copartnership, copartnery, corporealization,
   coverage, ecumenism, eligibility, embodiment, embracement,
   encompassment, enosis, envisagement, exhaustiveness, fabrication,
   fashioning, federalization, federation, fellowship, formation,
   fraternalism, fraternity, fraternization, freemasonry, fusion,
   getup, hookup, incarnation, inclusion, inclusiveness, integration,
   junction, junta, league, make, makeup, marriage, materialization,
   meld, melding, membership, merger, metempsychosis, mixture,
   openness, organization, package, package deal, participation,
   partnership, personification, piecing together, putting together,
   reception, reembodiment, reincarnation, setup, shaping, sodality,
   solidification, sorority, structure, structuring, substantiation,
   syncretism, syndication, syneresis, synthesis, tie-in, tie-up,
   tolerance, toleration, transmigration, unification, union, wedding,
   whole



Bouvier's Law Dictionary, Revised 6th Ed (1856):

INCORPORATION. This term is frequently confounded, particularly in the old
books, with corporation. The distinction between them is this, that by
incorporation is understood the act by which a corporation is created; by
corporation is meant the body thus created. Vide Corporation.



Bouvier's Law Dictionary, Revised 6th Ed (1856):

INCORPORATION, civil law. The union of one domain to another.