(in many legal phrases) a place or area, esp the place where something occurred

mathsa set of points whose location satisfies or is determined by one or more specified conditionsthe locus of points equidistant from a given point is a circle

geneticsthe position of a particular gene on a chromosome

Word Origin for locus

C18: Latin

locus classicus

nounpluralloci classici (ˈklæsɪˌsaɪ)

an authoritative and often quoted passage from a standard work

Word Origin for locus classicus

Latin: classical place

locus sigilli

nounpluralloci sigilli

the place to which the seal is affixed on legal documents, etc

(plural loci), 1715, "locality," from Latin locus "a place, spot, position," from Old Latin stlocus, literally "where something is placed," from PIE root *st(h)el- "to cause to stand, to place." Used by Latin writers for Greek topos. Mathematical sense by 1750.

In geometry, the set of all points (and only those points) that satisfy certain conditions; these points form a curve or figure. For example, the locus of all points in space one foot from a given point is a sphere having a radius of one foot and having its center at the given point. The locus of all points in a plane one foot from a given point is a circle having a radius of one foot and having its center at the given point.