(colloquial) The items of mail conveyed using aircraft.

Third-person singular simple present indicative form of airmail

The system of conveying mail using aircraft. / The items of mail so carried.

(transitive) To send mail by air. / (baseball) To (unintentionally) throw the ball well over a fielder's head where that fielder is unable to make a play on the ball.

present participle of airmail

simple past tense and past participle of airmail

Any aircraft used to send airmail / Mail sent by air