Definitions
1.AdjectiveHappening at the same time; simultaneous.
2.AdjectiveBelonging to the same period; contemporary.
3.AdjectiveActing in conjunction; agreeing in the same act or opinion; contributing to the same event or effect.
4.AdjectiveJoint and equal in authority; taking cognizance of similar questions; operating on the same objects."the concurrent jurisdiction of courts"
5.AdjectiveMeeting in one point.
6.AdjectiveRunning alongside one another on parallel courses; moving together in space.
7.AdjectiveDesigned to run independently, rather than sequentially, using various mechanisms, such as threads, event loops or time-slicing.
8.NounOne who, or that which, concurs; a joint or contributory cause.
9.NounOne pursuing the same course, or seeking the same objects; hence, a rival; an opponent.
10.NounOne of the supernumerary days of the year over fifty-two complete weeks; so called because they concur with the solar cycle, the course of which they follow.
11.NounOne who accompanies a sheriff's officer as witness.