Webster's English Dictionary

Enter the word to look up:

surveillance

sur.veil.lance \s*r-'va--l*n(t)s, -'va-l-y*n(t)s\ n [F, fr. surveiller to 
   watch over, fr. sur- + veiller to watch], fr. L vigilare, fr. vigil 
   watchful - more at VIGIL : close watch kept over a person or group (as by a 
   detective); also  : SUPERVISION