airmail (noun) /ˈɛə.meɪl/
1
The system of conveying mail using aircraft.
2
The items of mail so carried.
airmail (verb) /ˈɛə.meɪl/
1
(transitive) To send mail by air.
2
(baseball) To (unintentionally) throw the ball well over a fielder's head where that fielder is unable to make a play on the ball.