infinitesimal

Noun
  1. (mathematics) a variable that has zero as its limit (synset 105872631)
    referred to in: math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
    is a type of: variable, variable quantity - a quantity that can assume any of a set of values
Adjective
  1. Infinitely or immeasurably small (synset 301396483)
    "two minute whiplike threads of protoplasm"; "reduced to a microscopic scale"
    similar to: little, small - limited or below average in number or quantity or magnitude or extent
    same as: minute

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