Relating to or involving a mutual relationship where two things are closely connected and depend on each other.
From Latin correlativus, combining correlat- (from correlatus) and the adjective suffix -ive. The term became philosophical and linguistic in nature by the medieval period.
In grammar, correlative conjunctions like 'both...and' and 'either...or' work together as a team—they're examples of how language itself uses correlativity to show relationships between ideas.
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