What is the meaning of Pursuivant?

A follower.

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.

A Grand Lodge Officer who guards the inner door during a meeting of the Grand Lodge.

A royal messenger, one with the authority to execute warrants.

A warrant officer.

Source: wiktionary.org