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accretion Definition
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accretion
noun(ac-cre-tion)the process of growth or enlargement by a gradual buildup: such as
accretion
noun(ac-cre-tion)increase by external addition or accumulation (as by adhesion of external parts or particles)
accretion
noun(ac-cre-tion)the increase of land by the action of natural forces
accretion
noun(ac-cre-tion)a disk of usually gaseous matter surrounding a massive celestial object (such as a black hole) in which the matter gradually spirals in toward and accretes onto the object as a result of gravitational attraction