n. Want of physical coherence or cohesion; the state or quality of not holding or sticking together; looseness; separateness of parts: as, the incoherence of particles of sand; the incoherence of a fluid.n. Want of coherence or connection in thought or speech; incongruity; inconsequence; inconsistency; want of agreement or dependence of one part on another: as, incoherence of arguments, facts, or principles.