Englishfor English speakers
effective
Adjective
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An effective strategy, treatment, method, etc is one that works well as planned.
Teachers are using instructional strategies that are most effective in helping students learn.
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If you have effective command, consent, control, etc., you have it in practice but not officially.
The students had effective control over what the teacher would include on the test.
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If a law, agreement, change, etc. becomes effective, it officially begins.
The new rules about ball size are effective next season.
effective
Preposition
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You use effective to say when something starts officially.
Effective next week, all employees will wear the new uniform.
power
Noun
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energy, force, control. A quality that can make things happen.
His muscles have a lot of power.
The prime minister has power over the country.
Fight the power! (Meaning, "Fight authority!")
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Energy or electricity.
The city had no lights that night because there was no power.
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Power is how fast something uses energy. That is, how much work it does in a certain time.
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A special ability that someone might have.
In comic books many heroes have amazing powers.
often shows witches as having magical powers.
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A person or group of people with authority; that is a people who control things.
The mayor and the sheriff are the major powers in this town.
I like the idea, but the powers that be will not allow it.
power
Verb
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To provide power for or give power to (a mechanical or electronic device).
This CD player is powered by batteries.