nonjuror /nɒnˈdʒʊəɹə/ noun2 •(historical) Someone who refuses to swear a particular oath, specifically a clergyman who refused to take the oath of allegiance to William and Mary in 1689.Accident brought her into the Company of a Couple of Clergymen, disguised in Secular Habits, The one was a Venerable Old Nonjuror, the other, the Reverend Dr..... Dean of — [...]. — 1723 •One who is not a juror. formsnonjurors