infinitesimal - WordReference.com Dictionary of English

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  - infinitesimal calculus
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infinitesimal

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Concise Oxford English Dictionary © 2008 Oxford University Press:
infinitesimal /ˌɪnfɪnɪˈtɛsɪm(ə)l/

▶adjective extremely small. ▶noun Mathematics an indefinitely small quantity; a value approaching zero.

– derivatives
infinitesimally adverb.

– origin C17: from mod. L. infinitesimus, from L. infinitus (see infinite), on the pattern of centesimal.

'infinitesimal' also found in these Oxford entries:

calculus - differential - infinitesimal calculus - planetesimal - virtual

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