portreeve noun3 •A borough-reeve: an office equivalent to a mayor (historical) in several major English towns or (dialect) in various minor boroughs of Wales and Southwest England.Instead of the portgreve [of London], Richard the first ordained two bailiffs, but presently after him King John granted them a mayor for their yearly magistrate. — 1772 •(historical) A municipal office subordinate to a mayor, (especially) a bailiff. •(historical) A port reeve, a port warden. formsportreeves