1. of or pertaining to this world or earth as contrasted with heaven; worldly; earthly: mundane affairs.
2. common; ordinary; banal; unimaginative.
3. of or pertaining to the world, universe, or earth.
-noun, plural - cies.
1. insanity; mental disorder.
2. intermittent insanity, formerly believed to be related to phases of the moon.
3. extreme foolishness or an instance of it: Her decision to resign was sheer lunacy.
4. Law. unsoundness of mind sufficient to incapacitate one for civil transactions.