Nailed it on the last one. I was going to say, you can probably thank the American education system if it’s common enough to be recognized by dictionaries like those. And Zahille7 is probably American, too, which caused the snarky comment in the first place.
Just the usual case of English being a crazy language that ruffles through other languages’ coat pockets looking for loose adverbs.
Ah, the usual case of English and American being two entirely different languages despite pretending otherwise.