Posted in Engineering, Government & Military, Health & Medicine, Organizations ACOS stands for Arc Cosine (Inverse Cosine) ACOS stands for American College of Surgeons ACOS stands for Asthma-COPD (Chronic Obstructive Pulmonary Disease) Overlap Syndrome ACOS stands for Assistant Chief of Staff (also seen as A/COS) ACOS stands for Advanced Core Operating System ACOS stands for Associate Chief of Staff ACOS stands for American College of Osteopathic Surgeons ACOS stands for Advisory Committee on Safety (IEC) ACOS stands for A Change of Seasons (Dream Theater album) ACOS stands for A Crown of Swords (Wheel of Time; book 7) ACOS stands for Air and Space Communications Operations Squadron (US Air Force)