What does the root word ee mean?

The root word "ee" doesn't have a specific meaning on its own. It's usually part of a larger word, often used as a suffix to indicate:

* One who does something: Like "employee" (one who is employed), "payee" (one who receives payment), or "flee" (one who runs away).

* State of being: Like "sleepy" (in a state of sleep), "free" (in a state of freedom), or "happy" (in a state of happiness).

The meaning of "ee" depends entirely on the context of the word it's attached to.