A-1

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English[edit]

Adjective[edit]

A-1 (not comparable)

  1. Alternative spelling of A1.

Noun[edit]

A-1 (plural A-1s)

  1. (US, military, historical) Cox-Klemin A-1 Air Ambulance, never mass produced.
  2. (US, military) Skyraider single engine general-purpose attack aircraft.
  3. (US, military) Personnel section of an air force staff.
  4. (military) Air personnel officer.
  5. Angstrom.