What does abjure mean?
The definition of abjure
Ab*jure”, v. t.
[imp. & p. p. Abjured; p. pr. & vb. n. Abjuring.]
Etym: [L. abjurare to deny upon oath; ab + jurare to swear, fr. jus, juris, right, law; cf. F. abjurer. See Jury.]

1 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.
2 To renounce or reject with solemnity; to recant; to abandon forever; to reject; repudiate; as, to abjure errors. “Magic I here abjure.” Shak.

— See Renounce.

Ab*jure”, v. i.
To renounce on oath. Bp. Burnet.