/ˈlōkəs/
Noun, pl. loci
1. A particular position, point, or place. (Google Dictionary)
2. The effective or perceived location of something abstract. (Google Dictionary)
3. (Genetics) The position of a gene or mutation on a chromosome. (Google Dictionary)
4. (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. (Google Dictionary)
5. (Medicine) The site on the body where a pathogen enters. (biology-online.org)
Word origin: From Latin locus “a place, spot, position.