The word "except" is a preposition that indicates exclusion. It is used to specify that something or someone is not included in a statement or group. For example, if you say "Everyone except John attended the meeting," it means that John did not attend the meeting while all other individuals did.
The word "except" comes from the Latin word "excipere," which means "to take out, to take exception." It evolved through Old French "excepter" before adopting its current form in Middle English.