Definition of infinitesimal adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌɪnfɪnɪˈtesɪml//
; NAmE NAmE//ˌɪnfɪnɪˈtesɪml//
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extremely small synonym tiny infinitesimal traces of poison an infinitesimal risk Word Originmid 17th cent.: from modern Latin infinitesimus, from Latin infinitus, from in- ‘not’ + finitus ‘finished, finite’, past participle of finire, from finis ‘end’, on the pattern of centesimal.
See the Oxford Advanced American Dictionary entry: infinitesimal