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