They have had effective control of the area since the. The adjective effective has many shades of meaning, but you'll usually see it describing something that's able to produce a desired goal. Effective typically describes things such as policies, treatments, arguments, and techniques that do what they are intended to do.
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(used about a treatment or drug) working. Effective means having a particular role or result in practice, though not officially or in theory. Successful or achieving the results that you want:
Meaning, pronunciation, picture, example sentences, grammar, usage notes,.
Definition of effective adjective in oxford advanced learner's dictionary.
