loci

(noun) the scene of any event or action (especially the place of a meeting). Synonyms: venue, locale, locus.

(noun) the specific site of a particular gene on its chromosome. Synonyms: locus.

(noun) the set of all points or lines that satisfy or are determined by specific conditions. Synonyms: locus. Example: "The locus of points equidistant from a given point is a circle."