1. (noun) accretion, accumulation
an increase by natural growth or addition
Synonyms: collection, accrual, accruement, assemblage, accretion, accumulation, aggregation
2. (noun) accretion
something contributing to growth or increase
Synonyms: accumulation
3. (noun) accretion
(astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases
Synonyms: accumulation
4. (noun) accretion
(biology) growth by addition as by the adhesion of parts or particles
Synonyms: accumulation
5. (noun) accretion
(geology) an increase in land resulting from alluvial deposits or waterborne sediment
Synonyms: accumulation
6. (noun) accretion
(law) an increase in a beneficiary's share in an estate (as when a co-beneficiary dies or fails to meet some condition or rejects the inheritance)
Synonyms: accumulation
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Synonyms for accretion 
