"locus" in the noun sense
1. venue, locale, locus
the scene of any event or action (especially the place of a meeting)
2. locus
the specific site of a particular gene on its chromosome
3. locus
the set of all points or lines that satisfy or are determined by specific conditions
"the locus of points equidistant from a given point is a circle"
Source: WordNet® (An amazing lexical database of English)
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