PDA
PDA may refer to:
| Look up PDA in Wiktionary, the free dictionary. | 
Science and technology
    
- Patron-driven acquisition, a mechanism for libraries to purchase books
 - Personal digital assistant, a mobile device
 - Photodiode array, a type of detector
 - Polydiacetylenes, a family of conducting polymers
 - Pitch detection algorithm, to find the pitch of a signal
 - Pushdown automaton, a type of abstract device in automata theory
 
Biology and medicine
    
- Pancreatic ductal adenocarcinoma, the main type of pancreatic cancer
 - Patent ductus arteriosus, a heart defect
 - Posterior descending artery, an artery
 - Potato dextrose agar, a microbiological media for culturing yeast and fungus
 - Pathological demand avoidance
 
Music
    
- "PDA" (song), a song by Interpol
 - "PDA", a song by the Backstreet Boys from This Is Us
 - "PDA", a song by Audio Adrenaline from Audio Adrenaline
 - "P.D.A. (We Just Don't Care)", a song by John Legend
 
Organizations
    
- Parenteral Drug Association, a global pharmaceutical trade association
 - Pharmacists' Defence Association, UK
 - Peruvian Debate Association, for inter-school debating
 - Pinoy Dream Academy, the Philippine franchise of Endemol's Star Academy
 - Population and Community Development Association, Thailand
 - Private defense agency, an enterprise which would provide personal protection and military defense services to individuals
 - Professional Driver Association, of NASCAR drivers before the 1969 Talladega 500
 - Public development authority, government-owned corporations in Washington, US
 
Politics
    
- Alternative Democratic Pole, a political party in Colombia (Polo Democrático Alternativo)
 - Progressive Democratic Alliance, a former political party in British Columbia, Canada
 - Progressive Democrats of America, a progressive political organization
 - Party of Democratic Action, a Bosniak party in Bosnia-Herzegovina
 - Movement of Democratic Action, a political party in Bosnia-Herzegovina (Pokret demokratske akcije)
 - Aruban Democratic Party, an Aruban political party (Partido Democrático Arubano)
 
Law and culture
    
- Public display of affection
 - Pregnancy Discrimination Act, US
 - "PDA" (The Office), an episode from the American television sitcom The Office
 - Past Doctor Adventures, spin-off novels from the BBC's Doctor Who
 - Pub Design Awards, UK
 - Professional Development Award, offered by the Scottish Qualification Authority
 
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