MOA's a three-letter abbreviation with multiple meanings, as described below: Places Mall of America, the United States' largest mall Museum of Art (BYU) at Brigham Young University SM Mall of Asia in the Philippines Science & Math Minute of arc,'s a term relating to angular measurement; known as Minute Of Angle in firearms Magnetic Field Oscillating Amplified Thruster, a novel propulsion system with several terrestrial applications Mechanism of action, the means by which a drug exerts it… (More on Moa)