Michael Doelle wrote:

>When the meaning changes, the definition changes.  There is no practical
difference between a change in usage and a change in definition.<

No, that is not the case. A definition is implicitely unambiguous. Language
is anything but unambiguous. Which is why we're having this discussion.

Language is context specific, which is why different cultures have different
dictionaries, even when they appear to speak the same language.

So where do you look for the definition of a word?