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Douglas Harper's Etymology Dictionary
aren't

1794, contraction of are not, originally written are'n't and generally so into early 19c.\n\nIf "ain't I?" is objected to, surely "aren't I?" is very much worse.

[Lady Grove, "The Social Fetich," 1907]

Wiktionary
aren't

contraction 1 (contraction of are not English) 2 (context colloquial English) (non-gloss definition Spelling replacement of the homonym an't an’t, a contraction of “am not”, used e.g. in the construction ''aren’t I?'')

Usage examples of "aren't".

Ten or fifteen years from now you'll still be talking the talk and at least trying to walk the walk, like a woman in her thirties who wears miniskirts and goes braless in an effort to convince people (most of whom don't give a shit anyway) that her cheerleading days aren't behind her.

They aren't the sort of toys Bill and Junie would have approved of, anyhow their toy-buying ideas ran more to Barney than Star Wars, much to their kids' disgust.

It always seems to happen when things around here aren't going well, & oh God are things around here ever not going well!

The Stalky Little Boy started in before I even had breakfast on the table I always know when it's him instead of Seth because his eyes aren't dark brown but almost black.

Kids like the concept because it absolves them of judging functions, which most of them aren't very good at to begin with.

They aren't spooky ones at all, so don't get your hopes up on that score, but they are well-documented, at least.

I'm objecting particularly to her practice of pestering the Fleet for information they either don't have or aren't allowed to give for reasons of plain standard operational security.

Particularly since there aren't going to be any globes around tonight -- that is, if the Halpa attack-schedule has been correctly estimated.

There's no other way," she added, "and there aren't any reasonable methods.

These people are not ignorant, and they aren't easily frightened -- and they certainly have the resources to handle any expense factor.

They're all very popular wherever good doctors and good hospitals aren't readily available.

Individually, the ingots appear to be quite heavy, though they aren't very large.

Dowland said, "I think there is a race of beings who aren't quite in our time and space.

You aren't assuming that either of us has taken your rogue telepath seriously.

Because -- as the rogue knows very well -- we aren't bluffing in the least in this.