What word means to confirm or attest to something?

The word that means to confirm or attest to something is "verify." When you verify information, you are checking its accuracy or truthfulness, providing assurance that the details are correct. This can involve examining evidence, cross-checking facts, or validating sources to ensure the information aligns with reality.

Other options do have related meanings but focus on different nuances. For instance, "affirm" means to assert or state strongly, often used in declarations or affirmations of belief. "Corroborate" refers to providing additional evidence or support for a statement or theory, emphasizing the support aspect rather than the act of confirmation itself. "Validate" often involves confirming the legitimacy or appropriateness of something, particularly in terms of processes or systems. Each of these words shares some common ground with "verify," but "verify" specifically centers on the act of confirming or establishing the truth of something.