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accretion

Accretion refers to an extension or addition of length or overall size. (noun)

An example of an accretion is when a highway is lengthened.

Accretion is the part of something that has been added. (noun)

An example of an accretion is the garage someone may build on his home.

Accretion is the state of having gone through extension or addition of length or overall size. (noun)

An example of accretion is a extra part of a fairy tale added over many years of re-telling.

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See accretion in Webster's New World College Dictionary

See accretion in American Heritage Dictionary 4

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