# Locus (mathematics)

## Set of points that satisfy some specified conditions / From Wikipedia, the free encyclopedia

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In geometry, a **locus** (plural: *loci*) (Latin word for "place", "location") is a set of all points (commonly, a line, a line segment, a curve or a surface), whose location satisfies or is determined by one or more specified conditions.[1][2]

The set of the points that satisfy some property is often called the *locus of a point* satisfying this property. The use of the singular in this formulation is a witness that, until the end of the 19th century, mathematicians did not consider infinite sets. Instead of viewing lines and curves as sets of points, they viewed them as places where a point may be *located* or may move.