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tr.v. a·verred, a·ver·ring, a·vers
1. To affirm positively; declare: "Liberal politicians ... found it necessary to aver that they were in favor of rigid economy in public spending too" (John Kenneth Galbraith).
2. Law To assert formally as a fact.
[Middle English averren, from Old French averer, from Vulgar Latin *advērāre : Latin ad-, ad- + Latin vērus, true; see wērə-o- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
able to be proved or verified
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014