Meaning of INFINITESIMAL in English

INFINITESIMAL

I. (ˌ)in-ˌfi-nə-ˈte-sə-məl, -zə-məl noun

Etymology: New Latin infinitesimus infinite in rank, from Latin infinitus

Date: 1706

: an infinitesimal quantity or variable

II. adjective

Date: 1710

1. : taking on values arbitrarily close to but greater than zero

2. : immeasurably or incalculably small

an infinitesimal difference

• in·fin·i·tes·i·mal·ly -mə-lē adverb

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.