S / sessor
noun

sessor

gen. sessōris · gender masculine · decl. 3rd
one who sits; a sitter
one who sits in a place, a sitter (not ante-Aug. and very rare).
a sitter in the theatre
In gen., a sitter in the theatre, Hor. Ep. 2, 2, 130.—
A sitter upon a horse; a horseman; rider
A sitter upon a horse, a horseman, rider, Sen. Const. 12 fin.; Suet. Caes. 61; Veg. 2, 28, 34.—*
one who tarries; dwells; an inhabitant
In partic., one who tarries or dwells in a place, an inhabitant, resident: sessores veteres urbis, Nep. Cim. 2, 5.