Copernicus said:
Bunyip, let's not equivocate over the meaning of the verb "define". You are using it to mean something like "authorize usage", and that is one possible sense of the word. However, this is where people start talking past each other, because there is another sense--the one I was using. Lexicographers define words when they come up with a succinct expression that captures popular usage. That is actually what lexicographers do. They define words. But you are absolutely correct in pointing out that their definitions do not establish how people ought to use words.
Wrong. This is one of the purposes of dictionaries. So people use the correct words rather than sting together a bunch of words in a sentence that have no meaning.
https://www.oxforddictionaries.com/definition/english/dictionary
Well, there is truth to the point that people look up unfamiliar words in order to get a sense of how to use them. That is one of the purposes of a dictionary, and I can see where my statement could be construed in that way. What I meant to say was what I took to be agreement with Bunyip (although he prefers to construe everything I say as some kind of curmudgeonly disagreement, for some reason), that dictionary entries are not intended to create or enforce prescriptions for usage. Their function is primarily descriptive--to inform people how words are commonly used. Naturally, people usually wish to use words in a way that others understand them, so that is why they think dictionaries tell them how words "ought to be used". The problem is that bad dictionary definitions can actually influence people to use words in new ways. It is fascinating to see how people take some of these definitions as doctrinaire assertions of how the words must be used rather than how native speakers intuitively know to use them.
Dictionary definitions have been called
heuristic in the sense that they only give an indication of what the actual meaning of the word is. They help users to discover a word's meaning without actually exhaustively describing the properties of the word. So a lot of dictionaries will give definitions for the word "bachelor", one of which is simply "unmarried male". The online Merriam-Webster definition for
bachelor is "
a man who is not married; especially : a man who has never been married". However, English speakers know that there is more to it than that. The definition doesn't tell you this, but eligibility for marriage is an essential component of the meaning. Hence, it would be strange to refer to a Catholic priest as a "bachelor", since Catholic priests can't marry. That won't stop some people from looking the word up in a dictionary and letting the definition drive them to claiming that the Pope is a "bachelor". And they will do so with the same dogmatic assurance that our internet friends have in touting the silly "babies are atheists" claim.