Concurrent

Adjective

 * 1) Happening at the same time; simultaneous.
 * 2) Belonging to the same period; contemporary.
 * 3) Running alongside one another on parallel courses; moving together in space.
 * 4)  Involving more than one thread of computation.

Coordinate terms

 * leading, lagging

Derived terms

 * concurrent indicator
 * concurrently

Thesaurus
accessory, accompanying, accordant, agreeing, aligned, analogous, approaching, associate, associated, asymptotic, at one, at one with, attendant, attending, carried by acclamation, centripetal, centrolineal, coacting, coactive, coadjutant, coadjuvant, coadunate, coefficient, coetaneous, coeternal, coeval, coexistent, coexisting, coextending, coextensive, coincident, coinstantaneous, collaborative, collateral, collective, collectivist, collectivistic, collusive, combined, combining, commensal, common, communal, communalist, communalistic, communist, communistic, communitarian, compact, comprehensive, concerted, concomitant, concordant, concurring, confluent, confocal, conjoint, conjugate, conjunct, connivent, conniving, consentaneous, consilient, conspiratorial, contemporaneous, contemporary, conterminous, converging, cooperant, cooperating, cooperative, coordinate, corporate, correlative, coterminous, coupled, coworking, ecumenic, equal, equidistant, equispaced, even, fellow, focal, harmonious, harmonized, in agreement, inclusive, isochronal, isochronous, joined, joint, like-minded, lined up, meeting, mutual, mutually approaching, noncompetitive, nonconvergent, nondivergent, of a piece, of one accord, of one mind, paired, parallel, parallelepipedal, parallelinervate, paralleling, parallelodrome, parallelogrammatic, parallelogrammic, parallelotropic, parasitic, radial, radiating, reciprocal, saprophytic, simultaneous, solid, symbiotic, synchronal, synchronic, synchronous, synergetic, synergic, synergistic, tangent, tangential, twin, unanimous, unchallenged, uncompetitive, uncontested, uncontradicted, uncontroverted, unison, unisonous, united, uniting, unopposed, with one consent, with one voice