PAA may refer to: Businesses and organizations Pacific American Airlines Pamoja African Alliance, a Kenyan political party PanAfrican Archaeological Association Pan African Association Pan American World Airways, commonly known as Pan Am Pan American Association of Anatomy Pittsburgh Athletic Association, athletic and social club Polish American Association Population Association of America, dedicated to population and demography studies Portland Adventist Academy, an Adventist High School Science, technology and mathematics Chemistry and materials science Peroxyacetic acid, a chemical Phenylacetic acid, a chemical Phosphoamino acid analysis, a biochemistry technique Polyacrylamide, an acrylate polymer Polyacrylic acid, an acrylic polymer Primary Aromatic Amine, a group of compounds Electronic devices Personal Attack Alarm Piezo Audio Amplifier Linguistics Proto-Afroasiatic language Proto-Austroasiatic language Statistics , dimension reduction method Legislation Perpetuities and Accumulations Act 1964, UK act of Parliament Perpetuities and Accumulations Act 2009, UK act of Parliament Protect America Act of 2007, amendment to the US Foreign Intelligence Surveillance Act Other uses Penny Arcade Adventures, video game series Prueba de Aptitud Académica, standardized test for university admissions See also Paa (disambiguation)