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

infinitesimal

adjective
 
/ˌɪnfɪnɪˈtesɪml/
 
/ˌɪnfɪnɪˈtesɪml/
(formal)
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  1. 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 infinitesimal in the Oxford Advanced American Dictionary
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