<p><strong>Verb (used with object)</strong></p><ul><li>to place in or bring into mutual or reciprocal relation; establish in orderly connection: to correlate expenses and income.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to have a mutual or reciprocal relation; stand in correlation: The results of the two tests correlate to a high degree.</li></ul><p><strong>Adjective</strong></p><ul><li>mutually or reciprocally related.</li></ul><p><strong>Noun</strong></p><ul><li>either of two related things, especially when one implies the other.</li></ul>