Also 7 æq-, equipollencie, 9 æquipollency. [f. EQUIPOLLENT: see -ENCY.]
1. Equivalence in signification, authority, efficacy, virtue, etc. Cf. EQUIPOLLENCE 1.
1623. Rowlandson, God’s Bless., 5. They have an equipollency, or equall weight, with the plainest precepts.
a. 1638. Mede, in Spurgeon, Treas. Dav., Ps. xl. II. 273. What equipollency can be in sense between these two?
a. 1691. Boyle, Wks. (1772), III. 606. The endeavours of the one and the other were reduced to an equipollency.
1869. M. Arnold, Cult. & An., 183. The notion of this sort of equipollency in man’s modes of activity.
2. Logic. = EQUIPOLLENCE 2.
1652. Urquhart, Jewel, Wks. (1834), 199. The equipollencie and opposition both of plaine and modal enunciations.
1788. Reid, Aristotle’s Log., i. § 4. 15. The equipollency of propositions both pure and modal.
1846. Mill, Logic, II. i. § 2. Examples of equipollency or equivalence of propositions.
