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Definition of infinitesimal adjective from the Oxford Advanced American Dictionary

     

    infinitesimal

     adjective
    adjective
    NAmE//ˌɪnfɪnəˈtɛsəml//
     
    (formal)
     
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  1. 1extremely small synonym tiny
  2. 2 infinitesimal traces of poison an infinitesimal risk
infinitesimally
 
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NAmE//ˌɪnfɪnəˈtɛsəməli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: infinitesimal