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English definition of “infinitesimal”

infinitesimal

adjective uk   /ˌɪn.fɪ.nɪˈtes.ɪ.məl/ formal us  
extremely small: The amounts of radioactivity present were infinitesimal.Extremely smallSmall
infinitesimally
adverb uk   /-mə.li/ us  
infinitesimally smallExtremely smallSmall
(Definition of infinitesimal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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