What does AC stand for?

Atlas Centaur (US intermediate class expendable launch vehicle)

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government

Other Resources:

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Association for Coaching (London, UK) Associativity and Commutativity (math) Associazione Calcio (Italian: soccer club) Associazione Calcistica (Italian: Soccer Association) Assumption Iloilo Astrographic Catalogue Asynchronous Communications Atheist Crew Athletic Club Atlantic City		Atmospheric Chemistry Atmospheric Corrector Atomic Clock Attachment Circuit Attack Cargo Plane (military aircraft designation, as in AC-130) Attack Center Attack Console Attenuation Correction Attribute Certificate Audio Codec

Samples in periodicals archive:

Aerojet provided 12 small monopropellant hydrazine thrusters aboard the Atlas Centaur upper stage, eight retro rockets for the Atlas Centaur separation from the launch vehicle, and an additional eight monopropellant thrusters aboard the LRO spacecraft.

United States: Aerojet Supports NASA's Lunar Exploration Missions

It will use the spent second stage Atlas Centaur rocket in an unprecedented way that will culminate with two spectacular impacts on the moon's surface.

Satellites' launch to give boost to NASA's 'return to Moon' mission

Designated AC-160, this was the first Atlas Centaur mission launched for the national security community from the West Coast.

ILS Successfully Launches Atlas With NRO Payload