A nonparticipant spectator.

Roget 186: presence; occupancy, occupation; attendance; whereness^†.    permeation, pervasion; diffusion etc. (dispersion) 73.    ubiety^†, ubiquity, ubiquitariness^†; omnipresence.    bystander etc. (spectator) 444.    ... show more

Roget 444: spectator, beholder, observer, looker-on, onlooker, witness, eyewitness, bystander, passer by; sightseer; rubberneck, rubbernecker [U.S.].    spy; sentinel etc. (warning) 668.    ... show more

Roget 197: nearness etc. adj.; proximity, propinquity; vicinity, vicinage; neighborhood, adjacency; contiguity etc. 199.    short distance, short step, short cut; earshot, close quarters, stone's throw; bow shot, gun shot, pistol shot; hair's breadth, span.    purlieus, neighborhood, vicinage, environs, alentours [Fr.], suburbs, confines, banlieue^†, borderland; whereabouts.    bystander; neighbor, borderer^†.    approach etc. 286; convergence etc. 290; perihelion.    ... show more

Dutch: omstander
Polish: statysta