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  1. In genetics, the locus is the position on a chromosome where a specific gene is located.


  2. In mathematics, a locus is the set of all points (usually forming a curve or surface) that satisfy some condition. For example, the locus of points in the plane equidistant from a given point is a circle. Plural is "loci". The Latin word locus simply means "place." (The Greek equivalent is topos, which crops up in "topology".)

       • GEOMETRY