Meaning of INFINITESIMAL in English

INFINITESIMAL

I. noun Etymology: New Latin infinitesimus infinite in rank, from Latin infinitus Date: 1706 an ~ quantity or variable, II. adjective Date: 1710 taking on values arbitrarily close to but greater than zero, immeasurably or incalculably small , ~ly adverb

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.