"What are the non-functional requirements for the system?" "We don't have any." "Sorry?" "We want the system to function." "Oh, I see... in software we often use 'non-functional' to mean something else." "In English we use non-functional to mean non-functional." #UseTheRightWords

This is partly why I’ve always preferred calling them “cross functional” ever since I heard the alternative phrase from @sarahtarap