GNU Collaborative International Dictionary of English

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1.       
   Locus , n.; pl. Loci , & Loca . [L., place. Cf. Allow, Couch, Lieu, Local.]
   A place; a locality.
   1913 Webster
   (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