noun: (heraldry) A functionary of lower rank than a herald, but discharging similar duties; called also pursuivant at arms; an attendant of the heralds, e.g. in the College of Arms.
noun: (Freemasonry) A Grand Lodge Officer who guards the inner door during a meeting of the Grand Lodge
noun: A royal messenger, (particularly) one with the authority to execute warrants.
noun: (law enforcement, by extension) A warrant officer.