1 (of a person) able to speak intelligibly and articulately.
2 (of speech, an argument, etc.) logical and consistent; easily followed.
3 cohering; sticking together.
4 Physics (of waves) having a constant phase relationship.
Derivatives:
coherence n. coherency n. coherently adv.
Etymology: L cohaerere cohaerent- (as COHERE)
Useful english dictionary. 2012.