aver [əˈvɜr] v.t.
1.) To assert as a fact; to state positively, affirm.
2.) [Law] To prove or justify a plea; to offer to justify an exception pleaded; to make an averment.
3.) [Obs.] To declare true, assert the truth of (a statement).
4.) [Obs.] To prove true, confirm, verify.
5.) [Arch.] To assert the existence or occurrence of (Oxford English Dictionary, 2nd Ed.).
Etymology: Middle English averren, from Old French averer, from Vulgar Latin advrre : Latin ad- + Latin vrus, true.
"That is truth, pardy, said Dixon, and, or I err, a pregnant word. Which hearing young Stephen was a marvellous glad man and he averred that he who stealeth from the poor lendeth to the Lord for he was of a wild manner when he was drunken and that he was now in that taking it appeared eftsoons" (Ulysses, James Joyce, 1922).
Well, that's week one for MA. Thanks to all my followers, and thanks for the comments!