aver
Concise Oxford English Dictionary © 2008 Oxford University Press:
aver /əˈvəː/
▶verb (avers, averring, averred) formal state or assert to be the case.
■ Law allege as a fact in support of a plea.
– origin ME: from OFr. averer, based on L. ad ‘to’ + verus ‘true’.
'aver' also found in these Oxford entries:

