Propriety as a legal concept: fitness and appropriateness guiding conformity with rules and principles in interpretation. Propriety denotes the quality of fitness, appropriateness, and conformity with requirements, rules, or principles, encompassing notions of rightness and correctness. Definitions cited include doctrinal treatments from standard thesauri and the Oxford English Dictionary, which list synonyms such as fitness, aptness, and justness as integral to the concept.