"centraler" in the adjective sense
1. 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"
in or near a center or constituting a center the inner area
"a central position"
Source: WordNet® (An amazing lexical database of English)
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