D defs.my
Entry 1 sense Webster, 1913

Correlation

/(-l?"sh?n)/ · Cor·re·la·tion · IPA /ˌkɔɹ.əˈleɪ.ʃən/
01 n. Reciprocal relation; corresponding similarity or parallelism of relation or law; capacity of being converted into, or of giving place to, o…
  1. 1.
    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.
Phrases & compounds
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.