Undoing a dictionary mistake

While running through spellcheck, I accidentally clicked “learn” instead of “change” on a misspelled word. Is there a way to change this?

The spelling dictionary has nothing to do with Scrivener – it is provided by the system software. If you have a look on MacUpdate you will probably be able to find a free dictionary editor, but it does depend on what system you have. Some of them might not work on Mountain Lion.