Webster's Revised Unabridged Dictionary · 1913

Effective

Effective , adjective

[Latin effectivus: compare French effectif.]

Having the power to produce an effect or effects; producing a decided or decisive effect; efficient; serviceable; operative; as, an effective force, remedy, speech; the effective men in a regiment.
They are not effective of anything, nor leave no work behind them. — Bacon
Whosoever is an effective, real cause of doing his heighbor wrong, is criminal. — Jer. Taylor

Effective , noun

1.
That which produces a given effect; a cause. — Jer. Taylor
2.
One who is capable of active service.
He assembled his army -- 20,000 effectives -- at Corinth. — W. P. Johnston
3.
(Commerce) Specie or coin, as distinguished from paper currency; -- a term used in many parts of Europe. — Simmonds
4.
The serviceable soldiers in a country; an army or any military body, collectively; as, France's effective.