transitive. To make (a thing) certain; to guarantee as certain, attest in an authoritative manner; to give certain information of. (Often with clause…

transitive and intransitive. With subordinate clause as object or parenthetically within or after a statement: to convey assurance of some fact…

transitive. To bear witness to, or give proof of (a fact); to assert or affirm the truth of (a statement); to attest.

To confirm, corroborate, add support to (a statement, etc.). to fortify oneself: to confirm one's statement, etc. †Also (rarely) intransitive for refl…

To declare as a thing one can prove, or upon which one offers one's own express testimony as a personal witness; to affirm, assert. Now strictly of…

To prove true, confirm, verify. Obsolete.

To assert or affirm to be true or according to fact; to guarantee the truth or accuracy of (a statement, etc.); to attest or certify. Also const. ag…