in or near a center or constituting a center; the inner area; "a central position"
Adjective
serving as an essential component; "a cardinal rule"; "the central cause of the problem"; "an example that was fundamental to the argument"; "computers are fundamental to modern industrial structure" Synonyms: cardinal, fundamental, key, primal,
Noun
a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication Synonyms: telephone exchange, exchange,