Longman Dictionary of Contemporary English
Douglas Harper's Etymology Dictionary
Wiktionary
a. 1 Of or being a newspaper page, usually opposite the editorial page, that features signed articles expressing personal viewpoints. 2 Of an article, written in a style suitable for publication as an op-ed. 3 Of a person, regularly expressing viewpoints by means of op-eds. n. A newspaper page containing signed articles by commentators expressing viewpoints that may not agree with those espoused by the editorial board, traditionally printed '''op'''posite the '''ed'''itorial page.
Wikipedia
An op-ed (originally short for "opposite the editorial page" though sometimes interpreted as "opinion editorial") is a written prose piece typically published by a newspaper or magazine which expresses the opinion of a named author usually not affiliated with the publication editorial board. Op-eds are different from both editorials (opinion pieces submitted by editorial board members) and letters to the editor (opinion pieces submitted by readers).
Usage examples of "op-ed".
His think tank members did the Sunday morning talk show circuit, wrote op-ed pieces, published books, and gave speeches.
Besides, he’d get to do the odd consulting job, and do op-ed pieces for the newspapers, where he would assume the role of elder-statesman sage.
New York University professor Todd Gitlin wrote on the op-ed page that if a Gore cousin had been employed at one of the networks, “Can anyone reasonably doubt that the pundits would be working themselves into a nonstop lather charging ‘the liberal media’ as accessories to grand larceny?
Criticism of Anita Hill would never see the light of day on the nation’s op-ed pages or network news: Who was buying all these books?
Though he occupied prime real estate on the op-ed page of the Newspaper of Record, only one of Lewis’s four books ever became a best-seller.
New York University professor Todd Gitlin wrote on the op-ed page that if a Gore cousin had been employed at one of the networks, "Can anyone reasonably doubt that the pundits would be working themselves into a nonstop lather charging 'the liberal media' as accessories to grand larceny?
Criticism of Anita Hill would never see the light of day on the nation's op-ed pages or network news: Who was buying all these books?
Though he occupied prime real estate on the op-ed page of the Newspaper of Record, only one of Lewis's four books ever became a best-seller.
The Op-ED page was the Op-Center Executive Dossier page, a twice-daily summary of NCMC activities.
Though he occupied prime real estate on the op-ed page of the Newspaper of Record, only one of Lewis’.
Though he occupied prime real estate on the op-ed page of the Newspaper of Record, only one of Lewiss four books ever became a best-seller.
Not one article on Venona ever graced the front page or the op-ed page.
But then Clinton did it, and Gloria Steinem announced on the New York Times op-ed page that the new standard is: The boss gets one free grope.
He started his op-ed page career by saying that we were handling the war wrong.
Sometimes that hideously long face (it obscures most of his body, like the bloated head of a caricature on some newspaper's op-ed page) has two eyes, sometimes just one.