The term 'deemed true' is an expression used to describe something that has been accepted as fact or truth. It is often used in legal contexts, where a court or other authority has determined that a certain statement or claim is true. The crossword solution for this term is 'BELIEVED', which is an appropriate synonym for 'deemed true'. Believing something to be true is the same as deeming it true, and so the two terms are interchangeable in this context.