The Collaborative International Dictionary
Cointension
Cointension \Co`in*ten"sion\, n. The condition of being of equal in intensity; -- applied to relations; as, 3:6 and 6:12 are relations of cointension.
Cointension . . . is chosen indicate the equality of
relations in respect of the contrast between their
terms.
--H. Spencer.
Wiktionary
cointension
n. The condition of being of equal in intensity; applied to relations.