* Antecedent: Something that comes before something else, especially in a logical or causal sequence.
* Antebellum: Existing or occurring before a war, especially the American Civil War.
* Anterior: Situated at the front or forward part of something.
* Antechamber: A small room leading to a larger one.
* Antelope: A type of hooved mammal (though this one's origin is a bit more complicated, as it's derived from an ancient Greek word).
Let me know if you'd like more examples!