Pronunciation: (lō'kus),[key] —n., —pl.-ciPronunciation: (-sī, -kē, -kī),[key]-caPronunciation: (-ku).[key] 1. a place; locality.
2. a center or source, as of activities or power: locus of control. 3. Math.the set of all points, lines, or surfaces that satisfy a given requirement.
4. Genetics.the chromosomal position of a gene as determined by its linear order relative to the other genes on that chromosome.