co‧her‧ence also co‧her‧en‧cy [uncountable]
when something such as a piece of writing is easy to understand because its parts are connected in a clear and reasonable way:
An overall theme will help to give your essay coherence.
He had a coherence of outlook and thought.
if a group has coherence, its members are connected or united because they share common aims, qualities, or beliefs:
A common religion ensures the coherence of the tribe.