What is the meaning of root word lib?

The root word "lib" doesn't have a common, widely recognized meaning. It's more likely you're thinking of a different root word, or a combination of letters that appear in several words but don't constitute a root in themselves.

For example, you might be thinking of:

* "liber" - This Latin root means "free" or "book". It appears in words like "liberate", "liberty", "library", and "liberal".

* "libel" - This word refers to a published false statement that is damaging to a person's reputation. It's not a root word but a complete word on its own.

Please provide more context about where you encountered the word "lib" or what kind of word you are looking for. That would help me give you a more accurate answer.