Englishfor English speakers
authoritative
Adjective
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If someone is authoritative, they seem to have power and are likely obeyed.
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If something is authoritative, it is based on all the most important information.
source
Verb
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If you source something, then you obtain or receive it.
source
Noun
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The source of some material, an idea, a product, etc. is the place it came from originally.
XYZ company can't supply these parts anymore, so we need to find a new source.
Church sources said four people were injured and 100 to 200 were taken away by the police.
The paper comes primarily from British sources.
is the main source of global warming.