Black's Law Dictionary (2nd edition)dictionaries

Serjeant

The same word etymologic-ally with “sergeant,” but the latter spelling is more commonly employed in the deslgna-tlon of military and police officers, (see Seb-geant,) while the former is preferred when the term is used to describe certain grades of legal practitioners and certain officers of legislative bodies. See infra

Source: Black's Law Dictionary 2nd Ed (1910)