Definitions

1. noun

A person who sits in a seat, especially at a sports event or in a theater

“The stadium had a capacity for 20,000 seater”

2. noun

A chair or seat, especially one that is fixed in place

“The hotel room had a small seater for reading”

3. noun

A person who occupies or uses a seat in an aircraft, especially in relation to seat allocation or seating arrangements

“The flight attendants were responsible for assigning seater to passengers”