Effective, effectual, efficacious, efficient refer to that which is able to produce a (desired) effect.
Effective is applied to that which has the power to, or which actually does, produce an effect:
An effective.
Producing a result that is wanted having an intended effect;
In use active
Calculation of effective stress, the theory of which is an effective theory in mathematics and logic, effective is used to describe metalogical methods that fit the criteria of an effective procedure.
Effective typically describes things—such as policies, treatments, arguments, and techniques—that do what they are intended to do.
People can also be described as effective when they accomplish what.
Definition of effective adjective in oxford advanced learner's dictionary.
Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
The adjective effective describes things that are adequate to accomplish a purpose, or that produce the intended or expected result.
But effective isn't quite the same as effectual, efficacious, or efficient!
Successful or achieving the results that you want:
(used about a treatment or drug) working.
Learn more.
Effective means having a particular role or result in practice, though not officially or in theory.
They have had effective control of the area since the security forces left.