Coherence is from Latincohaerere = stick together, to be connected with). See:
Coherence (physics). Coherence is an attribute of physical quantities that can be described in terms of waves when a well-defined wavefront can be defined, as in classical optics.
Coherence (linguistics) . In linguistics, coherence is what makes a text semantically meaningful.
Coherence (Bayesian statistics). In Bayesian decision theory , an inference system of probabilities and utilities is coherent if it is immune to the possibility of a "Dutch book paradox"; see coherence (philosophical gambling strategy).