What is "air chief marshal"

n. (alternative case form of air chief marshal nodot=1 English) (qualifier: found when the term is used as a title).

Air chief marshal (Air Chf Mshl or ACM) is a four-star air officer rank which originated in and continues to be used by the Royal Air Force, where it is the most senior peacetime air force rank. The rank is also used by the air forces of many countries which have historical British influence and it is sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure.

Air chief marshal is a four-star air officer rank and has a NATO ranking code of OF-9. An air chief marshal is equivalent to an admiral in the Royal Navy or a General in the British Army or the Royal Marines. In other forces, such as the United States Armed Forces and the Canadian Armed Forces, the equivalent four-star rank is General.

The rank of air chief marshal is immediately senior to the rank of air marshal but subordinate to marshal of the air force. Air chief marshals are sometimes generically considered to be air marshals.

Air chief marshal (abbreviated as ACM) is the highest active rank of the Royal Australian Air Force and was created as a direct equivalent of the British Royal Air Force rank of air chief marshal. It is also considered a four-star rank. The only time the rank is held is when the Chief of the Defence Force is an Air Force officer.

Air chief marshal is a higher rank than air marshal and is a lower rank than Marshal of the Royal Australian Air Force, which has only ever been awarded as an honorary rank. Air chief marshal is a direct equivalent of admiral in the Royal Australian Navy and general in the Australian Army.