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Merriam-Webster’s Collegiate Dictionary, Tenth Edition is unavailable, but you can change that!

Merriam-Webster’s Collegiate Dictionary is based on the world’s largest collection of information about the way the English language is written and spoken in our time—a citation file of over 14½ million examples of English words drawn from actual use, more than 1 million collected since the last edition. The volume also includes: well-drafted Definitions and Pronunciations, Extensive...

the process of growth or enlargement by a gradual buildup: as a : increase by external addition or accumulation (as by adhesion of external parts or particles) b : the increase of land by the action of natural forces 2 : a product of accretion; especially : an extraneous addition 〈accretions of grime〉 — ac•cre•tion•ary \-shə-ˌner-ē\ adjective — ac•cre•tive \ə-ˈkrē-tiv\ adjective