a role; an assignment or duty (the part one plays or responsibilities allocated).
チーム内で自分の役割を理解することが大切だ。
It's important to understand your role within the team.
父親と母親、それぞれの役割は家庭によって違う。
The roles of father and mother differ depending on the family.
彼はプロジェクトで重要な役割を果たした。
He played an important role in the project.