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The Collaborative International Dictionary of English v.0.48:

Locus \Lo"cus\, n.; pl. Loci, & Loca. [L., place. Cf. Allow, Couch, Lieu, Local.] 1. A place; a locality. [1913 Webster] 2. (Math.) The line traced by a point which varies its position according to some determinate law; the surface described by a point or line that moves according to a given law. [1913 Webster] Plane locus, a locus that is a straight line, or a circle. Solid locus, a locus that is one of the conic sections. [1913 Webster]