You Keep Using That Word

""You keep using that word. I do not think it means what you think it means.""

- Inigo Montoya, The Princess Bride, after one "Inconceivable!" too many from Vizzini.

Language evolves. Over time, as people speak a language, some of its words take on new meanings, and the old meanings may fall into disuse. Sometimes the new usages become mainstream; when was the last time you heard someone (who wasn't trying to be funny -- and likely failing) use "gay" to mean anything other than "homosexual" or as a disparaging term? Sometimes, things are more... contentious.

This trope covers those words that writers, and indeed people in general, are frequently accused of misusing, although given the continual evolution of any spoken language, exactly what constitutes a "misuse" is hotly contested. The most common examples can be sorted into categories of varying pedantry. The more pedantic ones may rely on obscure usages or represent a vain attempt by linguistic purists to turn back the clock on the evolution of language (sometimes to a supposed past state that never actually existed), often accompanied by the belief that linguistic evolution is always "degradation."

The usage may simply be so widespread that, while the "correct" usage is still valuable in some contexts, one can generally get away with the "incorrect" colloquial usage. The less pedantic ones, though, will probably elicit eye rolls at least from most people with an interest in language or a university education. Then there are some words that are just so specific that nobody actually bothers to look up what they really mean. This happens most often to scientific or medical terms.

In some rare cases, the opposite may happen: a shorter word may be replaced by a longer one, either coined or borrowed, because the writer thinks using longer words makes his character (or himself) seem more intelligent. See "irregardless" below for an example of pompous writers trying to create a word.

This isn't a general style guide; these are specifically words that have commonly contested usages. Homophones, humorous misspellings and bizarre malapropisms belong in The Big List of Booboos and Blunders or Rouge Angles of Satin. For errors of punctuation rather than usage, see Wanton Cruelty to the Common Comma.

Subpages:

 * Very Pedantic (Original meaning is often forgotten, or the "wrong" meaning has also become accepted as correct - even by language teachers.)
 * Moderately Pedantic (Meaning is largely dependent on context, or the meaning has started to drift in popular use.)
 * Less Pedantic (Common errors that do not match current definitions and are considered wrong by most people.)

And finally...

 * Inconceivable. It means that something is impossible even to imagine (or, depending on usage, to conceive in a biological sense, such as an inter-species crossbreed), although there is some variability to this. Anything that is truly and utterly inconceivable would by definition be unimaginable in any way, shape or form by our minds (including the mere concept), as they simply weren’t designed to conjure up such information. In any case, it does not mean "impossible", "highly unlikely", or "unfortunate". (It should be noted that this may not be a valid definition, but it's perfectly valid as hyperbole.) The closest synonym would probably be "incomprehensible". For example, a triangle appearing floating in midair above your head is unlikely, while the mathematical construct of the triangle existing in the real world is impossible. The triangle being four-sided is inconceivable.
 * Incidentally, it is possible Vizzini was using the word correctly. He has a pretty high opinion of himself; it could well be that the idea of someone besting his plans is not something that happens in his reality.
 * The first time, at least. He has no excuse for the repeated usage. After the first one or two times, he really should have caught on that yes, it's conceivable for his plans to not work out perfectly.