Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Modern Latin
Origin: infinitesimus 'infinite in rank', from Latin infinitus

infinitesimal

 adjective
     
in‧fin‧i‧tes‧i‧mal
extremely small:
infinitesimal changes in temperature
—infinitesimally adverb:
infinitesimally small
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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