Added 8 October 2026 behaviour noun Categories: Describing WordsActionsEveryday Words noun ! Definition from Wiktionary (CC BY-SA). More about behaviour at Wordnik → Where our words come from → British standard spelling of behavior. Related Words: behaviordemeanourdemeanordeportmentconductbehavioralbehaviouralethicsphenomenonmannerpatternbehaviourally Back to today's word