If they find the old governments effete, worn out, . . . they may seek new ones.
Burke.
Ef`fi*ca"cious (?), a. [L. eficax, -acis, fr. efficere. See Effect, n.] Possessing the quality of being effective; productive of, or powerful to produce, the effect intended; as, an efficacious law.
Syn. -- See Effectual.
-- Ef`fi*ca"cious*ly, adv. -- Ef`fi*ca"cious*ness, n.
Ef`fi*cac"i*ty (?), n. [L. efficacitas: cf. F. efficacité.] Efficacy. [R.] J. Fryth.
Ef"fi*ca*cy (?), n. [L. efficacia, fr. efficax. See Efficacious.] Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer. "Of noxious efficacy." Milton.
Syn. -- Virtue; force; energy; potency; efficiency.
{ Ef*fi"cience (?), Ef*fi"cien*cy (?), } n. [L. efficientia.] 1. The quality of being efficient or producing an effect or effects; efficient power; effectual agency.
The manner of this divine efficiency being far above us.
Hooker.