(military) a soldier fit for duty

Having the power to produce a required effect or effects. / Producing a decided or decisive effect. / Efficient, serviceable, or operative, available for useful work. / Actually in effect.

In an efficient or effective manner; with powerful effect. / Essentially, in effect, for all practical purposes.

The property of being effective, of achieving results. / The capacity or potential for achieving results. / The degree to which something achieves results.

plural of effective

plural of effectiveness

plural of effect

Third-person singular simple present indicative form of effect

(uncountable) The ability or power to be effective. / (countable) A measure of the effectiveness of something.

Operating or functioning; in force; in play.