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Definition of infinitesimal adjective from the Oxford Advanced American Dictionary

 

infinitesimal

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