coherent >> /ˌkoʊˈhɪrənt/
Definition: [adjective] (of an argument, theory, or policy) logical and consistent.
Example: they failed to develop a coherent economic strategy
Definition: [adjective] United as or forming a whole.
Example: divided into a number of geographically coherent kingdoms
Definition: [adjective] (of waves) having a constant phase relationship.
Example: There are of course lasers with wavelengths in the infrared, masers that emit coherent microwaves, and even x-ray lasers.