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

Causative, effective.

present participle of effect

Operating or functioning; in force; in play.

For all practical purposes; in practice; actually; essentially; basically.

Alternative form of effector

(dated, 1600s) Capable of being done or achieved.

(dated, 1600s) Capability of being done or achieved.

plural of effective

plural of effectivity