adjective

1. having to do with a convention or assembly
2. of, sanctioned by, or growing out of custom or usage; customary
3. 1. depending on or conforming to formal or accepted standards or rules rather than nature; not natural, original, or spontaneous conventional behavior
   2. not unusual or extreme; ordinary
4. stylized; conventionalized
5. nonnuclear conventional weapons
6. Law based on an agreement between parties; contractual

Etymology: LL conventionalis