accident, accompaniment, accord, accordance, affinity, agreement, alliance, assent, association, cahoots, chance, chorus, co-occurrence, co-working, coaction, coequality, coetaneity, coetaneousness, coevality, coevalneity, coevalness, coexistence, coextension, coherence, collaboration, collectivity, collusion, combination, combined effort, compatibility, concert, concerted action, concomitance, concomitancy, concord, concordance, concourse, concurrence, confluence, conformance, conformation, conformity, congeniality, congruence, congruency, congruity, conjunction, consilience, consistency, consonance, consort, conspiracy, contemporaneity, contemporaneousness, cooperation, correspondence, equality, equivalence, fluke, fortuitousness, fortuity, happenstance, harmony, homogeneity, homoousia, identity, indistinguishability, intersection, isochronism, junction, luck, matching, no difference, oneness, overlap, parallelism, parasitism, peace, rapport, sameness, saprophytism, self-consistency, self-identity, selfhood, selfness, selfsameness, simultaneity, symbiosis, symmetry, sync, synchronism, synchronization, synergy, synonymity, synonymousness, synonymy, tally, timing, togetherness, uniformity, union, unison, unisonance, united action, unity, withness
identity, sameness, coincidence
, coalescence, convertibility, equality, selfness, self, oneself, identification, monotony, tautology, facsimile, homoousia: alter ego, ipsissima verba, same, self, very, one and the same, very thing, actual thing, real McCoy, no other, one and only, in the flesh, identical, self, ilk, the same, selfsame, one and the same, homoousian, coincide, coalescent, coalescing, indistinguishable, one, equivalent, tweedle dee and tweedle dum, much the same, of a muchness, unaltered, identically, on all fours.
synchronism, coexistence, coincidence
, simultaneousness, simultaneity, concurrence, concomitance, unity of time, interim, isochronism, contemporary, coetanian, synchronous, synchronal, synchronic, synchronical, synchronistical, simultaneous, coexisting, coincident, concomitant, concurrent, coeval, coevous, contemporary, contemporaneous, coetaneous, coeternal, isochronous, at the same time, simultaneously, together, in concert, during the same time, in the same breath, pari passu, in the interim, as one, at the very moment, just as, as soon as, meanwhile.
concurrence, cooperation, coagency, union, agreement, consilience, consent, coincidence
, alliance, concert, additivity, synergy, partnership, common cause, concurring, concurrent, in alliance with, banded together, of one mind, at one with, coinciding, with one consent.
contiguity, contact, proximity, apposition, abuttal, juxtaposition, abutment, osculation, meeting, appulse, rencontre, rencounter, syzygy, coincidence
, coexistence, adhesion, touching, (touch), borderland, frontier, tangent, abutter, contiguous, touching, in contact, conterminous, end to end, osculatory, pertingent, tangential, hand to hand, close to, with no interval.