Entry 2 senses · 2 variants Webster, 1913 Surveillant · Sur·veil·lant · IPA /[sɚˈvælənt]/ n. a. 01 n. One who watches over another; an overseer; a spy; a supervisor. pl. Surveillants ((#)) 1. One who watches over another; an overseer; a spy; a supervisor. 02 a. Overseeing; watchful. 1. Overseeing; watchful.