In a central manner; at or near the center; in a way that emphasizes central importance.
From central + -ly (adverbial suffix). The -ly ending comes from Old English and creates adverbs from adjectives.
A city that's centrally located has advantages (easy access) but disadvantages (higher prices, more crowded)—which is why you see expensive neighborhoods clustering in the center of most major cities.
Complete word intelligence in one call. Free tier — 50 lookups/day.