Meaning of LOCUS in English

lo ‧ cus /ˈləʊkəs $ ˈloʊsaɪ, -ki/ BrE AmE noun ( plural loci /ˈləʊsaɪ $ ˈloʊ-/) [countable] formal

[ Date: 1700-1800 ; Language: Latin ; Origin: 'place' ]

the place where something is particularly known to exist, or which is the centre of something

locus of

The Politburo was the locus of all power in the Soviet Union.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.