What part of speech is the word all ready?

The phrase "all ready" is actually two words functioning as an adjective meaning "completely prepared."

Here's why:

* "All" is an adjective in this case, modifying the word "ready."

* "Ready" is an adjective meaning "prepared" or "willing."

Example:

* "We are all ready to go to the party."

It's easy to confuse "all ready" with "already," which is an adverb meaning "previously" or "by this time."