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Adjective: infinitesimal  ,in-fi-ni'te-su-mul
  1. Infinitely or immeasurably small
    "The chances of winning the lottery are infinitesimal";
    - minute
Noun: infinitesimal  ,in-fi-ni'te-su-mul
  1. (mathematics) a variable that has zero as its limit
    "The concept of infinitesimals was crucial in the development of calculus"

Derived forms: infinitesimals

See also: little, small

Type of: variable, variable quantity

Encyclopedia: Infinitesimal