The term 'machinal' refers to a concept in expressionism that emphasizes the mechanical and dehumanizing aspects of modern life. This idea is often represented through characters who feel trapped in a monotonous, robotic existence, reflecting the alienation and disconnection that can arise in an industrialized society. In American drama, this term encapsulates the struggle between individual identity and societal expectations, where characters frequently find themselves at odds with the oppressive structures surrounding them.