Here are some examples of words that use the prefix "ex":
* Exhale: To breathe out.
* Exit: To go out of a place.
* Ex-wife: A woman who is no longer married to someone.
* Ex-president: A former president.
* Export: To send goods out of a country.
* Extract: To take something out of something else.
The meaning of "ex" will vary depending on the word it is attached to.
Please provide the full word you are asking about so I can provide a more specific answer.