Any is used to talk about one, some, or all of a group, especially when it doesn’t matter which one.
From Old English "ænig" meaning "one of many" or "of some kind," related to "one." Over time it broadened from "one of" to "no matter which".
"Any" is sneaky: it can mean "at least one" (Do you have any questions?) or "none at all" (I don’t have any). We decode the meaning almost entirely from context, without even noticing the ambiguity.
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