(law) an inference of the truth of a fact from other facts proved or admitted or judicially noticed WordNet 3.0 & Open English WordNet

In law, a presumption is an "inference of a particular fact". Wikipedia

Legal acceptance of a fact without requiring proof Wikidata

That which one holds to be true; the acceptance of a fact, opinion, or assertion as real or true despite a lack of strong evidence or knowledge. OmegaWiki

An inference that a trier of fact is either permitted or required to draw under certain factual circumstances (as prescribed by legislative or judicial law) unless the party against whom the inference is drawn is able to rebut it with admissible, competent evidence. Wiktionary