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.
domain
Noun
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A domain is a field or area of knowledge or skill, or of where a rule is in force.
The question of whether there is a god or not is not within the domain of science.
The copyright is expired and the book is now in the public domain.
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A domain is a large area owned by a person or controlled by a government.
The Royal Domain of Drottningholm stands on an island in Lake Mälar in a suburb of Stockholm.
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A domain (name) is a group of internet addresses or URLs that share the same last section (e.g., nowikihttp://simple./nowikiuwiktionary.org/u/wiki/domain is in the wiktionary.org domain.)
If you want to set up a web site, the first step is probably to register a domain name such as amazon.com or google.com.