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The Collaborative International Dictionary of English v.0.48 (gcide)

Effectual \Ef*fec"tu*al\ (?; 135), a. [See {Effect}, n.]
Producing, or having adequate power or force to produce, an
intended effect; adequate; efficient; operative; decisive.
--Shak.
[1913 Webster]

Effectual steps for the suppression of the rebellion.
--Macaulay.
[1913 Webster]

{Effectual calling} (Theol.), a doctrine concerning the work
of the Holy Spirit in producing conviction of sin and
acceptance of salvation by Christ, -- one of the five
points of Calvinism. See {Calvinism}.

Syn: {Effectual}, {Efficacious}, {Effective}.

Usage: An efficacious remedy is had recourse to, and proves
effective if it does decided good, effectual if it
does all the good desired. --C. J. Smith.
[1913 Webster]