Coherent

a.
  1. Sticking together; cleaving; as the parts of bodies; solid or fluid.
  2. Composed of mutually dependent parts; making a logical whole; consistent; as, a coherent plan, argument, or discourse.
  3. Logically consistent; -- applied to persons; as, a coherent thinker.
  4. Suitable or suited; adapted; accordant.
  5. (Physics, Optics) Of or pertaining to electromagnetic waves that have a constant phase relationship with each other; having identical phase at all points; as, the coherent light produced by a laser.