Englishfor English speakers
established
Adjective
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If an institution, system, etc. is established, it has existed for some time and is probably well known.
The established church leaders often do no wish to see changes that might reduce their power.
The fact that the earth is a ball is well established.
usage
Noun
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The way or the amount of using; use.
I learnt the usage of some verbs while studying the language.
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A habit or accepted practice.