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I know the word in French, but I was unaware that this word is also used in BrE.

Cahiers?!?!? I've never heard of this word before.

Whoops!

I'm reading an article on Wikipedia about it that says the name could be derived from "tetrad", which may be derived from "тетрядь". But it's kind of a long shot if you ask me.

BTW, isn't it...