Accretion

Accretion may refer to:

Science

 * Accretion (astrophysics), the formation of planets and other bodies by collection of material through gravity
 * Accretion (meteorology), the process by which water vapor in clouds forms water droplets around nucleation sites
 * Accretion (coastal management), the process where coastal sediments return to the visible portion of the beach following storm erosion
 * Accretion (geology), the increase in size of a tectonic plate by addition of material along a convergent boundary
 * Accretionary wedge

Other uses

 * Accretion (finance), predictable changes in the price of certain securities