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- Dictionaryinfinitesimal/ˌɪnfɪnɪˈtɛsɪml/
adjective
- 1. extremely small: "an infinitesimal pause"
noun
- 1. an indefinitely small quantity; a value approaching zero.
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adjective
noun
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Nonzero positive ‘number’ smaller than any positive real number, formalizable in a number of ways
In mathematics, an infinitesimal number is a non-zero quantity that is closer to 0 than any non-zero real number is. The word infinitesimal comes from a 17th-century Modern Latin coinage infinitesimus, which originally referred to the "infinity-eth" item in a sequence. Wikipedia