Phonetic: /lo·​cus/

Part of Speech: Noun

Definition

the place where something is situated or occurs : site, location
Was the culture of medicine in the beginning dispersed from a single focus or did it arise in several loci?
—S. C. Harvey

a center of activity, attention, or concentration
In democracy the locus of power is in the people.
—H. G. Rickover

the set of all points whose location is determined by stated conditions