PAA may refer to:

Businesses and organizations

PanAfrican Archaeological Association The PanAfrican Archaeological Association (PAA) is a pan-African professional organisation for archaeologists, geologists and palaeoanthropologists. History The association was founded by Louis Leakey and its first congress was held in Nairo ...

Pan African Association The African Association, known as the Pan-African Association after 1900, was an organization formed by leaders of African descent to "promote and protect the interests of all subjects claiming African descent, wholly or in part, in British colo ...

Pan American World Airways Pan American World Airways, originally founded as Pan American Airways and commonly known as Pan Am, was an American airline that was the principal and largest international air carrier and unofficial overseas flag carrier of the United States ...

, commonly known as Pan Am * Pan American Association of Anatomy *

Pittsburgh Athletic Association The Pittsburgh Athletic Association was a private social club and athletic club in Pittsburgh, Pennsylvania, USA. Its clubhouse is listed on the National Register of Historic Places. Located at the corner of Fifth Avenue and Bigelow Boulevard ...

, athletic and social club * Polish American Association *

Population Association of America The Population Association of America (PAA) is a non-profit scientific professional association dedicated to the study of issues related to population and demography. The PAA was established by Henry Pratt Fairchild and Frederick Osborn, with fu ...

, dedicated to population and demography studies * Portland Adventist Academy, an Adventist High School

Science, technology and mathematics

Chemistry and materials science

Peroxyacetic acid Peracetic acid (also known as peroxyacetic acid, or PAA) is an organic compound with the formula CH3CO3H. This peroxy acid is a colorless liquid with a characteristic acrid odor reminiscent of acetic acid. It can be highly corrosive. Peracetic ac ...

, a chemical * Phenylacetic acid, a chemical * Phosphoamino acid analysis, a biochemistry technique *

Polyacrylamide Polyacrylamide (abbreviated as PAM) is a polymer with the formula (-CH2CHCONH2-). It has a linear-chain structure. PAM is highly water-absorbent, forming a soft gel when hydrated. In 2008, an estimated 750,000,000 kg were produced, mainly f ...

, an acrylate polymer *

Polyacrylic acid Poly(acrylic acid) (PAA; trade name Carbomer) is a polymer with the formula (CH2-CHCO2H)n. It is a derivative of acrylic acid (CH2=CHCO2H). In addition to the homopolymers, a variety of copolymers and crosslinked polymers, and partially deproto ...

, an acrylic polymer * Primary Aromatic Amine, a group of compounds

Electronic devices

* Personal Attack Alarm * Piezo Audio Amplifier

Linguistics

Proto-Afroasiatic language Proto-Afroasiatic, sometimes also referred to as Proto-Afrasian, is the reconstructed proto-language from which all modern Afroasiatic languages are descended. Though estimations vary widely, it is believed by scholars to have been spoken as a si ...

Proto-Austroasiatic language Proto-Austroasiatic is the reconstructed ancestor of the Austroasiatic languages. Proto-Mon–Khmer (i.e., all Austroasiatic branches except for Munda) has been reconstructed in Harry L. Shorto's ''Mon–Khmer Comparative Dictionary'', while ...

Statistics

* , dimension reduction method

Political parties

* Pamoja African Alliance

Legislation

Perpetuities and Accumulations Act 1964 The Perpetuities and Accumulations Act 1964 (13 Eliz. 2c 55 is an Act of the Parliament of the United Kingdom. In English land law it reformed the rule against perpetuities The rule against perpetuities is a legal rule in the American common ...

, UK act of Parliament *

Perpetuities and Accumulations Act 2009 The Perpetuities and Accumulations Act 2009 (c. 18) is an Act of the Parliament of the United Kingdom that reforms the rule against perpetuities. The Act resulted from a Law Commission report published in 1998. It abolishes the rule against per ...

, 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