After Body - Hull form aft of the midship section.
Category: - Maritime

Aftermost - Nearest the stern.
Category: - Maritime

After Peak - The compartment in the narrow part of the stern, aft of the last watertight bulkhead.
Category: - Maritime

After Peak Bulkhead - Watertight bulkhead farthest aft.
Category: - Maritime

After Perpendicular - A vertical straight line at, or near the after edge of rudderpost.
Category: - Maritime

Aggregate - To gather into a sum, or whole, such as merging data sets, or adding up consequences
Category: - Risk

AGL - Above Ground Level describes an aircraft's height above the ground. It should not be confused with ASL which is the height above sea level.
Category: - Acronym - SAR

Air Controller - The Canadian Forces Officers who work at the Rescue Coordination Centres are referred to as Air Controllers. They are responsible for tasking resources on any air incidents which occur during their shift. They work in conjunction with the duty Marine Controller.
Category: - SAR

Aircrew - The Aircrew are the personnel who actually fly and work in the aircraft on a full-time basis. This would include Pilots, Navigators, Flight Engineers, Search and Rescue Technicians (SAR Techs) and Loadmasters on the Hercules. Spotters and medical personnel other than the SAR Techs are not considered to be Aircrew."
Category: - SAR

Air Mass - A large, horizontal body of air with a uniform distribution of moisture and temperature throughout.
Category: - Maritime