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Accretion may refer to:

  • Accretion (astrophysics), the formation of planets and other bodies by collection of material through gravity
  • Accretion (atmosphere), the process by which water vapor in clouds forms water droplets around nucleation sites
  • Accretion (meteorology), the process by which a larger hydro-meteor grows by collecting smaller ones lying in its path as it falls through a cloud.
  • Accretion (geology), the increase in size of a tectonic plate by addition of material along a convergent boundary