Behavioural means to do with how people or animals act. Behavioural science, behavioural problems, a behavioural change.
Behavioural economics is the field that studies how people actually decide rather than how a rational agent would, and it has changed policy in a way few academic fields do. This is the British spelling; American writing has behavioral without the u.
1adjectivebehaviouralTo do with how people or animals act.
“The boy's behavioural problems improved once he moved to a smaller school.”
behavioural is a quality of action.
Also accepted in games: behavioral
From behaviour + -al.
Etymology from Wiktionary, CC BY-SA