Concomitant1. (a.) Accompanying; existing concurrently; as, concominant plans.
2. (n.) One who, or that which, accompanies, or is collaterally connected with another; a companion; an associate; an accompaniment.
Thesaurus Entries
accession, accessory, accompaniment, accompanying, accordant, addenda, addendum, additament, addition, additive, additory, additum, adjunct, adjuvant, agreeing, annex, annexation, appanage, appendage, appendant, appurtenance, appurtenant, associate, associated, at one with, attachment, attendant, attending, augment, augmentation, coacting, coactive, coadunate, coda, coetaneous, coeternal, coeval, coexistent, coexisting, coincident, coinstantaneous, collaborative, collateral, collective, collusive, combined, combining, companion, complement, concerted, concordant, concurrent, concurring, conjoint, consilient, consort, conspiratorial, contemporaneous, contemporary, conterminous, continuation, cooperant, cooperative, coordinate, corollary, correlative, coterminous, coupled, coworking, dead heat, draw, extension, extrapolation, fellow, fixture, harmonious, increase, increment, isochronal, isochronous, joined, joint, mate, meeting, mutual, offshoot, paired, parallel, parasitic, pendant, reinforcement, saprophytic, side effect, side issue, simultaneous, supplement, symbiotic, synchronous, synergetic, synergic, synergistic, tailpiece, tie, twin, undergirding, unison, unisonous, united, uniting