PDE may refer to:

Mathematics

  • Partial differential equation, differential equation involving partial derivatives (of a function of multiple variables)

Life sciences

  • Phosphodiesterase, enzyme important in intracellular communication
  • Pug dog encephalitis

Organizations

  • The European Democratic Party (esp. in Spanish, French or Italian languages)
  • The Pennsylvania Department of Education

Technology and engineering

  • Program development environment
  • Pulse detonation engine, proposed substitute to the traditional jet engine <!-- does this differ from an engine of a pulsejet? -->

Philosophy

  • Principle of double effect

Places

  • Punta del Este

Other modes of abbreviation

  • Polydichloric euthimal, fictional substance <!-- in a fraud? in a titled work? -->
  • Pde (or Pde.), "Parade" (when serving as part of the proper name of a street or other way)
  • Present Day English
  • Preliminary Determination of Epicenters, the final earthquake bulletin of the National Earthquake Information Center (NEIC)