Then (as now) aver meant "To assert as fact; to state positively, affirm" ("aver" 4). At the time of the writing of the first edition of the OED, the oldest still-extant sense of aver was a legal one.
This discussion is based on the definition of the word aver in the first edition of the Oxford English Dictionary, which requires a little explanation.
To Act I or Act II of Gilbert and Sullivan's The Mikado.
To the homepage of this Mikado website.
Suggestions, contributions, criticisms, questions? Email Sharon Cogdill.
College of Fine Arts and Humanities
This URL: http://web.stcloudstate.edu/scogdill/mikado/aver.html.
Last update: 19 May 1998.