(1):
(a.) Based upon tradition, whether religious and historical or of artistic rules.
(2):
(a.) Formed by agreement or compact; stipulated.
(3):
(a.) Abstracted; removed from close representation of nature by the deliberate selection of what is to be represented and what is to be rejected; as, a conventional flower; a conventional shell. Cf. Conventionalize, v. t.
(4):
(a.) Growing out of, or depending on, custom or tacit agreement; sanctioned by general concurrence or usage; formal.