The Collaborative International Dictionary of English v.0.48:

Conformity \Con*form"i*ty\, n.; pl. Conformities. [Cf. F.
   conformit['e].]
   1. Correspondence in form, manner, or character; resemblance;
      agreement; congruity; -- followed by to, with, or between.
      [1913 Webster]

            By our conformity to God.             --Tillotson.
      [1913 Webster]

            The end of all religion is but to draw us to a
            conformity with God.                  --Dr. H.More.
      [1913 Webster]

            A conformity between the mental taste and the
            sensitive taste.                      --Addison.
      [1913 Webster]

   2. (Eng. Eccl. Hist.) Compliance with the usages of the
      Established Church.
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            The king [James I.] soon afterward put forth a
            proclamation requiring all ecclesiastical and civil
            officers to do their duty by enforcing conformity.
                                                  --Hallam.
      [1913 Webster]

WordNet (r) 3.0 (2006):

conformity
    n 1: correspondence in form or appearance [syn: conformity,
         conformance]
    2: acting according to certain accepted standards; "their
       financial statements are in conformity with generally
       accepted accounting practices" [syn: conformity,
       conformation, compliance, abidance] [ant:
       disobedience, noncompliance, nonconformance,
       nonconformity]
    3: orthodoxy in thoughts and belief [syn: conformity,
       conformism] [ant: nonconformance, nonconformism,
       nonconformity]
    4: concurrence of opinion; "we are in accord with your proposal"
       [syn: accord, conformity, accordance]
    5: hardened conventionality [syn: ossification, conformity]

Moby Thesaurus II by Grady Ward, 1.0:

184 Moby Thesaurus words for "conformity":
   accord, accordance, acquiescence, acquittal, acquittance,
   adherence, adoration, affinity, agreement, alikeness, allegiance,
   alliance, analogy, aping, approach, approximation, assent,
   assimilation, balance, bienseance, bilateral symmetry, bon ton,
   care, carrying out, chorus, churchgoing, civility, closeness,
   coherence, coincidence, community, comparability, comparison,
   compatibility, compliance, concert, concord, concordance,
   conformance, conformation, congeniality, congruence, congruency,
   congruity, consistency, consonance, consort, consuetude,
   convenance, convention, conventional usage, conventionalism,
   conventionality, cooperation, copying, correctness, correspondence,
   cultism, custom, decency, decorousness, decorum, devotedness,
   devotion, devoutness, discharge, duteousness, dutifulness,
   dynamic symmetry, equality, equilibrium, equivalence,
   established way, etiquette, eurythmics, eurythmy, evenness,
   execution, faith, faithfulness, fashion, fealty, finish, folkway,
   form, formality, fulfillment, good form, harmony, heed, heeding,
   homage, identity, imitation, intersection, keeping, likeness,
   likening, love of God, loyalty, manner, manners, metaphor,
   mimicking, mores, multilateral symmetry, nearness, obedience,
   obediency, observance, observation, oneness, overlap, parallelism,
   parity, peace, performance, pietism, piety, piousness, polarity,
   practice, praxis, prescription, proper thing, proportion,
   proportionality, propriety, rapport, regularity, religion,
   religionism, religiousness, resemblance, resignation, respect,
   reverence, ritual, sameness, satisfaction, seemliness,
   self-consistency, semblance, service, servility, servitium,
   shapeliness, similarity, simile, similitude, simulation,
   social convention, social usage, standard behavior, standard usage,
   standing custom, submission, submissiveness, suit and service,
   suit service, symmetricalness, symmetry, sync, synchronism, tally,
   theism, time-honored practice, timing, tradition,
   trilateral symmetry, uniformity, union, unison, unisonance, usage,
   use, veneration, way, what is done, willingness, wont, wonting,
   worship, worshipfulness