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'Accretion' may refer to:

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

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Accretion in science

Accretion in science

In science, accretion is a process in which the size of something gradually increases by steady addition of smaller parts. This term is used with specific meanings in several scientific fields:

★ Accretion (astrophysics)

★ Accretion (atmosphere) in meteorology, is the process by which water vapor in clouds forms water droplets around nucleation sites.

★ Accretion (geology) is an increase in size of a tectonic plate by addition of material along a convergent boundary.

★ Accretion (coastal management) is the process where coastal sediments return to the visible portion of the beach following storm erosion.