There are several words that might be used that way, but the best fits would probably be "presume" or "stipulate".
I assume you know what the word means.
In biology, the word eukaryote means true nucleus.
Assumption
The word valid means true and the word faulty means false.
The word that means across the continent is, transcontinental.
Your. example: Your word is true. Thy word is true.It means "Yours, or belonging to you. (Thy words are true or your words are true) The other word associated with Thy is Thine.)
postulates
This answer is going to sound a little weird, but I'm going to try not to use the word 'assume'.This is making a statement about a variable or function or mathematical property without knowing if that is the correct statement. It is typically used in proofs. Often we will try to prove something is not true, so we assume that it is true. That means we make a statement that 'it is true'. Then proceed with if it's true, what else is true, or what will happen if this is true. If this leads to a contradiction, then you can say that the original assumption was incorrect.
استنتاج pronounced: estentag which means to assume or conclude
The word "and" means both statements must be true. The word "or" means that at least one of the statements must be true.
Assume is a word that means to take power of something. A good sentence would be, the woman assumed full responsibility for the accident that caused the damage.
The Latin equivalent of 'true rumors' is Rumores veri. In the word-by-word translation, the noun 'rumores' means 'rumors'. The adjective 'veri' means 'true'.