news (n.)
late 14c., "new things," plural of new (n.) "new thing" (see new (adj.)); after French nouvelles, which was used in Bible translations to render Medieval Latin nova (neuter plural) "news," literally "new things."
The English word was construed as singular at least from the 1560s, but it sometimes still was regarded as plural 17c.-19c. The odd and doubtful construction probably accounts for the absurd folk-etymology (attested by 1640 but originally, and in 18c. usually, in jest-books) that claims it to be an abbreviation of north east south west, as though "information from all quarters of the compass."
The meaning "tidings, intelligence of something that has lately taken place" is from early 15c. The meaning "radio or television program presenting current events" is from 1923. Bad news in the extended sense of "unpleasant person or situation" is from 1926. Expression no news, good news can be traced to 1640s. Expression news to me "something I did not know" is from 1889.
I'm surprised. Merriam-Webster is usually the Urban Dictionary of print dictionaries. I'd have more expected them to change their definition because "muh common usage."