Locus
Pronunciation : Lo"cus, n.; pl. Loci
Part of Speech : &
Etymology : [L., place. Cf. Allow, Couch, Lieu, Local.]
Definition : 1. A place; a locality.
2. (Math.)
Defn: 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.
Loca.
Source : Webster's Unabridged Dictionary, 1913