Final answer:
The term for a dogma held as true by members of a movement is 'tenet'. It represents a principle or belief that is accepted by the group.
Step-by-step explanation:
The term for a dogma held as true by members of a movement is tenet. A tenet is a principle, belief, or doctrine generally held to be true, especially by an organization or group. Other options like doctrine, belief, and creed may also hold similar meanings but may be used in different contexts. In religious or philosophical movements, these terms can be used to refer to the core principles that guide the beliefs and practices of its members.