efficacia
From LSJ
Τί κοινότατον; ἐλπίς. καὶ γὰρ οἷς ἄλλο μηδέν, αὕτη πάρεστι → What is most common? Hope. For those who have nothing else, that is always there.
Latin > English (Lewis & Short)
effĭcācĭa: ae, f. efficax,
I efficacy, efficiency, virtue (post-Aug.), Plin. 11, 5, 4, § 12; Amm. 14, 8, 5; 16, 12, 25; Vulg. Sirach, 9, 4; Lact. de Ira D. 10, 37.
