Webster's Revised Unabridged Dictionary · 1913

Correlation

Correlation (-l?"sh?n) , noun

[Late Latin correlatio; Latin cor- + relatio: compare French corrélation. Compare Correlation.]

Reciprocal relation; corresponding similarity or parallelism of relation or law; capacity of being converted into, or of giving place to, one another, under certain conditions; as, the correlation of forces, or of zymotic diseases.
Collocations (2)
Correlation of energy , the relation to one another of different forms of energy; -- usually having some reference to the principle of conservation of energy. See Conservation of energy, under Conservation.
Correlation of forces , the relation between the forces which matter, endowed with various forms of energy, may exert.