conventionala.[L. conventionalis: cf. F. conventionnel.]1. Formed by agreement or compact; stipulated.()Conventional services reserved by tenures upon grants, made out of the crown or knights' service. (Sir M. Hale.)2. Growing out of, or depending on, custom or tacit agreement; sanctioned by general concurrence or usage; formal.(Whewell.)The conventional language appropriated to monarchs. (Motley.)The ordinary salutations, and other points of social behavior, are conventional. (Latham.)3. (Fine Arts) Based upon tradition, whether religious and historical or of artistic rules.()