Jhānavibhaṅga › Suttantabhājanīya

Abhidhammapiṭaka · Vibhaṅga · Vol. 35 · Section 670

[670] "Equanimous" (upekkhako): Herein, what is equanimity (upekkhā)? That which is equanimity, the being equanimous, the looking on with equanimity, the neutrality of mind (citta) — this is called equanimity. With this equanimity he is endowed … possessed. Therefore he is called "equanimous."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.