The Collaborative International Dictionary of English v.0.48:

Disjunction \Dis*junc"tion\, n. [L. disjunctio.]
   1. The act of disjoining; disunion; separation; a parting;
      as, the disjunction of soul and body.
      [1913 Webster]

   2. A disjunctive proposition. --Coleridge.
      [1913 Webster]

WordNet (r) 3.0 (2006):

disjunction
    n 1: state of being disconnected [syn: disjunction,
         disjuncture, disconnection, disconnectedness] [ant:
         connectedness, connection, link]
    2: the act of breaking a connection [syn: disconnection,
       disjunction]

Moby Thesaurus II by Grady Ward, 1.0:

200 Moby Thesaurus words for "disjunction":
   ablation, abstraction, accord, addition, adjunct, affairs,
   affiliation, affinity, alienation, alliance, aloofness, alteration,
   analysis, anarchy, anatomization, approximation, assemblage,
   association, atomization, bond, breakup, broken thread, brokenness,
   change, chaos, clearance, closeness, combination, confusion,
   connectedness, connection, contiguity, contrariety, corrosion,
   crumbling, dealings, decay, decomposition, deduction, degradation,
   demarcation, deportation, derangement, desynonymization,
   detachment, differencing, differentiation, diffusion, dilapidation,
   disarrangement, disarray, disarticulation, disassociation, discard,
   discomfiture, discomposure, disconcertedness, disconnectedness,
   disconnection, discontinuance, discontinuation, discontinuity,
   discontinuousness, discreteness, discrimination, disengagement,
   disequalization, disharmony, dishevelment, disintegration,
   disjointing, disjuncture, dislocation, disorder, disorderliness,
   disorganization, dispersal, dispersion, disposal, disposition,
   disproportion, disruption, dissociation, dissolution, distinction,
   distinguishment, disturbance, disunion, diversification, division,
   divorce, divorcement, ejection, elimination, entropy, episode,
   eradication, erosion, exile, expatriation, expulsion, filiation,
   fitfulness, haphazardness, homology, immateriality, impertinence,
   inapplicability, inappositeness, incoherence, incompleteness,
   inconnection, inconsequence, inconsistency, independence,
   indiscriminateness, individualization, individuation,
   inharmonious harmony, intercourse, intermittence, intimacy,
   irregularity, irrelation, irrelevance, isolation, junction,
   liaison, link, linkage, linking, liquidation, luxation,
   modification, most admired disorder, mutual attraction, nearness,
   non sequitur, nonadhesion, noncohesion, noncontinuance,
   nonlinearity, nonseriality, nonsymmetry, nonuniformity, ostracism,
   outlawing, outlawry, parenthesis, particularization, parting,
   partition, personalization, perturbation, promiscuity,
   promiscuousness, propinquity, proximity, purge, randomness,
   rapport, ravages of time, relatedness, relation, relations,
   relationship, removal, resolution, riddance, scattering,
   segmentation, segregation, separateness, separation, separatism,
   severalization, severance, similarity, specialization, subdivision,
   subtraction, suspension, sympathy, tie, tie-in, turbulence,
   unadherence, unadhesiveness, unconnectedness, union, unrelatedness,
   unsymmetry, untenacity, ununiformity, upset, variation, wear,
   wear and tear, withdrawal, zoning