To renounce upon oath; to forswear; to disavow; as, to abjure allegiance to a prince. To abjure the realm, is to swear to abandon it forever.

To renounce or reject with solemnity; to recant; to abandon forever; to reject; repudiate; as, to abjure errors.

To renounce on oath.

formally reject or disavow a formerly held belief, usually under pressure; "He retracted his earlier statements about his religion"; "She abjured her beliefs"

v. To recant, renounce, repudiate under oath.