(n.) Suitableness of one thing to another; agreement; consistency.

accord accordance affinity agreement assent chorus coequality coherence coincidence compatibility concert concord concordance conformance conformation conformity congeniality congruency congruity consistency consonance consort cooperation correspondence equality equivalence harmony homogeneity homoousia identity indistinguishability intersection no difference oneness overlap parallelism peace rapport sameness self-consistency self-identity selfhood selfness selfsameness symmetry sync synchronism synonymity synonymousness synonymy tally timing uniformity union unison unisonance unity