Coherence is a quality of having logically or aesthetically ordered or integrated parts that afford comprehension or recognition. One of the principles of design, coherence is largely synonymous with unity. A whole is coherent if its parts are so ordered or integrated. Incoherence is the opposite of coherence.Also see arrangement, balance, chaos, closure, communication, comparison, composition, comprehension, contrast, gestalt, harmony, irony, juxtaposition, knowledge, and meaning.