Accretion Definition
 ə-krēshən 
  accretions
  
    noun
  
 
    accretions
  
Growth or increase in size by gradual external addition, fusion, or inclusion.
 American Heritage 
Growth in size, esp. by addition or accumulation.
 Webster's New World 
Something contributing to such growth or increase.
 American Heritage 
A growing together of parts normally separate.
 Webster's New World 
The growing together or adherence of parts that are normally separate.
 American Heritage 
Synonyms: 
  Other Word Forms of Accretion
Noun
Singular:
 accretionPlural:
 accretionsOrigin of Accretion
-  
Latin accrētiō accrētiōn- from accrētus past participle of accrēscere to grow accrue
From American Heritage Dictionary of the English Language, 5th Edition
 -  
From Latin accretio, from ad (“to”) + crēscō (“grow”).
From Wiktionary
 -  
Compare crescent, increase, accrue
From Wiktionary
 First attested in the 1610's.
From Wiktionary
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