The Collaborative International Dictionary
Plane locus
Locus \Lo"cus\, n.; pl. Loci, & Loca. [L., place. Cf. Allow, Couch, Lieu, Local.]
A place; a locality.
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(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.
Plane locus, a locus that is a straight line, or a circle.
Solid locus, a locus that is one of the conic sections.