Synonyms: substantiation, validation, proof
Definition: the act of validating; finding or testing the truth of something
Similar words: determination, finding
Definition: the act of determining the properties of something, usually by research or calculation
Usage: the determination of molecular structures
Synonyms: confirmation, verification, substantiation, check
Definition: additional proof that something that was believed (some fact or hypothesis or theory) is correct
Usage: fossils provided further confirmation of the evolutionary theory
Similar words: proof, cogent evidence
Definition: any factual evidence that helps to establish the truth of something
Usage: if you have any proof for what you say, now is the time to produce it