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exactly. plus it makes sense, there’s no reason why decimate can’t mean reduce to one tenth.
It’s right there in the word. deci 1/10 mate from matus to remove. It’s like expecting half price to mean 1/3 price. We use deci all the time to mean 1/10 Decileter, decimal, etc.
maybe you misread my comment. I already said 1/10.