locus

locus is a   Noun

Definition:

[1] A place; a locality.

[2] 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.

Synonyms: