Concurrent

1. Happening at the same time; simultaneous.
2. Belonging to the same period; contemporary.
3. Acting in conjunction; agreeing in the same act or opinion; contributing to the same event or effect.
4. Joint and equal in authority; taking cognizance of similar questions; operating on the same objects.
5. (geometry) Meeting in one point.
6. Running alongside one another on parallel courses; moving together in space.
7. (computing) Involving more than one thread of computation