1. (adj) central, telephone exchange, exchange
a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
2. (adj) cardinal, central, 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"
3. (adj) central
in or near a center or constituting a center; the inner area
"a central position"
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