ἰσοσθένεια

A. equipollence, [τῶν αἰσθήσεων] Epicur. Fr. 36, cf. Chrysipp.Stoic. 2.37, S.E. P. 1.8, D.L. 9.74.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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