* A misspelling: Could it be a misspelling of a different word?
* A regional term: It might be a local word or dialect word from a specific region.
* A made-up word: It might be a fictional name or a word invented for a specific purpose.
To understand what "lemoignan" means, we need more context. Please provide:
* The full sentence or phrase where you encountered the word.
* The source or context where you found it.
With more information, I might be able to help you figure out what "lemoignan" means.