loci

'loci'

[venue.n.01] as in: the scene of any event or action (especially the place of a meeting)

'loci'

[locus.n.02] as in: the specific site of a particular gene on its chromosome

'loci'

[locus.n.03] as in: the set of all points or lines that satisfy or are determined by specific conditions

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Examples:
the locus of points equidistant from a given point is a circle