In physics, coherence length is the propagation distance over which a coherent wave (e.g. an electromagnetic wave) maintains a specified degree of coherence.

Justification through consistency among beliefs.

Consistency across shared data copies.

Imaging technique using light reflection.

Duration over which waves maintain phase.

Coherence theories of truth characterize truth as a property of whole systems of propositions that can be ascribed to individual propositions only derivatively according to their coherence with the whole.