Definition of "serjeant"

Jones did not think fit to acquaint the serjeant with his design; though he might have done it with great safety, for the halberdier was himself a man of honour, and had killed his man.

1749, Henry Fielding, The History of Tom Jones, a Foundling, volumes (please specify |volume=I to VI), London: A[ndrew] Millar, […]

I never knew chearfulneſs.—My enjoyments have been the hard fare of a common ſoldier, and the ſeverity of the ſerjeant into the bargain.

1798, Augustus von Kotzebue, translated by Stephen Porter, Lovers’ Vows, or, The Child of Love. […], London: […] J. Parsons, […], page 82