Webster's Revised Unabridged Dictionary · 1913

Effectual

Effectual (?; 135) , adjective

[See Effect, n.]

Producing, or having adequate power or force to produce, an intended effect; adequate; efficient; operative; decisive. — Shakespeare
Effectual steps for the suppression of the rebellion. — Macaulay
Collocations (1)
Effectual calling (Theology) , 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.