WordNet (r) 3.0 (2006):

gestalt
    n 1: a configuration or pattern of elements so unified as a
         whole that it cannot be described merely as a sum of its
         parts

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "gestalt":
   alentours, ambience, ambit, angle, aspect, borderlands, circle,
   circuit, circumambiencies, circumjacencies, circumstances, compass,
   configuration, context, contour, delineation, effect, eidolon,
   entourage, environing circumstances, environment, environs, facet,
   fashion, feature, features, figuration, figure, figure-ground,
   form, framework, guise, habitat, image, imago, impression, light,
   likeness, lineaments, lines, look, main features, manner, milieu,
   neighborhood, outline, outposts, outskirts, pattern, perimeter,
   periphery, phase, phasis, precincts, profile, purlieus, reference,
   regard, relief, respect, seeming, semblance, shape, shapes, side,
   silhouette, simulacrum, situation, skeleton, slant, style, suburbs,
   surroundings, total effect, total environment, tournure, twist,
   vicinage, vicinity, view, viewpoint, wise