Correlation

google

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mid 16th century: from medieval Latin correlatio(n- ), from cor- ‘together’ + relatio (see relation).

wiktionary

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From Middle French corrélation Morphologically correlate +‎ -ion

etymonline

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correlation (n.)

1560s, "mutual relation, interdependence, interconnection," from French corrélation, from cor- "together" (see com-) + relation (see relation). Meaning "action of bringing into orderly connection" is by 1879.