The meaning of OK is all right. How to use OK in a sentence. During the 1960s, NASA astronauts popularized the phrase A-OK to signal that all systems were go. And 56 years ago this week, OK was among the first words spoken from Earth to the Moon. Celebrity news and the latest showbiz, TV and soap spoilers from OK! Magazine. The best celeb pictures, video and entertainment stories in the UK OK is one of the most frequently used and recognised words in the world. But what do the letters ‘O’ and ‘K’ actually stand for? We take a look at three popular theories about its origin. Discover the fascinating history of 'OK', the world's most widely used expression. From its mysterious 19th century origins to becoming a global phenomenon, trace how 'OK' evolved from American slang to the language we speak today. OK (/ ˌoʊˈkeɪ / ⓘ), with spelling variations including okay, O.K. and many others, is an English word (originating in American English) denoting approval, acceptance, agreement, assent, acknowledgment, or a sign of indifference. OK is frequently used as a loanword in other languages. O.K., Okay, Okeh let's talk about the world's favorite word in this 5th episode of Origin of Words. Where does OK come from? What does OK stand for? And what did OK originally mean? Stay updated with the latest celebrity news, trending entertainment news, gossip & exclusive interviews. Get breaking news headlines on OK! Magazine. The history of OK! How a Boston editor's 1839 joke became the world's most used word, and why Martin Van Buren saved it from extinction. Stay updated with the latest headlines, trending politics, and today’s top news. Get breaking updates now on OK! Magazine.