Source
/sˈɔrs/
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Definition
(noun) The person, place, or thing from which something (information, goods, etc.) comes or is acquired.
Sentence Examples
What is your greatest source of inspiration?
Your idea cannot be brand new. I heard about it from another source last year.
CEFR Practice Quiz
The journalist refused to reveal the secret ____ of the information to protect the whistleblower's identity.