A source that is considered reliable and trustworthy.
1. According to the authoritative source, the new policy will be implemented next month. 2. The report cited multiple authoritative sources to support its findings.
1. "The greatest glory in living lies not in never falling, but in rising every time we fall." *Nelson Mandela, authoritative source 2. "I have not failed. I've just found 10,000 ways that won't work." *Thomas Edison, authoritative source