1. relating to or concerning the way a person or animal acts or conducts themselves
Usage: British spelling; American English typically uses 'behavioral'
2. of or relating to the study of behavior, especially in psychology or biology
Usage: commonly used in academic and scientific contexts

Examples

• The school implemented a new behavioural policy to address student conduct.
• Behavioural therapy has proven effective in treating anxiety disorders.
• The psychologist studied the behavioural patterns of the chimpanzees in the wild.
• Behavioural economics examines how people make financial decisions.
• The child's behavioural problems improved after consistent positive reinforcement.
• Researchers observed significant behavioural changes in the test group.