lo·ci
lo·cus
noun: locus
plural noun: loci
TECHNICAL
a particular position, point, or place.
"it is impossible to specify the exact locus in the brain of these neural events"
the effective or perceived location of something abstract.
"the real locus of power is the informal council"
GENETICS
the position of a gene or mutation on a chromosome.
MATHEMATICS
a curve or other figure formed by all the points satisfying a particular equation of the relation between coordinates, or by a point, line, or surface moving according to mathematically defined conditions.