There's no denying that the Latin root negāre has given English some useful words. That verb, which means "to deny," is the source of the noun abnegation, a synonym of denial. In time, people concluded that if there was a noun abnegation, there ought to be a related verb abnegate, and so they created one by a process called back-formation (that's the process of trimming an affix off a long word to make a shorter one). Other English offspring of negāre are deny, negate, and renegade.
abnegated all claims to the deceased lord's domain felt that if the Congress adopted these security measures, it would be abnegating the nation's fundamental commitment to individual rights
Recent Examples on the WebAbnegating this responsibility is going against the will of the people and we were voted in to protect the interests of the people. Jan Engoren, Sun-Sentinel.com, 6 July 2017
Word History
Etymology
borrowed from Latin abnegātus, past participle of abnegāre "to refute, decline, deny," from ab-ab- + negāre "to say no, deny" — more at negate