#1
central s. [
cardinal, fundamental, key, primal] 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"
. wn #2
central a. in or near a center or constituting a center; the inner area; "a central position"
. wn #3
central n. [
telephone exchange, exchange] a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
. wn