Etymology
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infinitesimal (adj.)

1710 (1650s as a noun), "infinitely small, less than any assignable quantity," from Modern Latin infinitesimus, from Latin infinitus "infinite" (see infinite) + ordinal word-forming element -esimus, as in centesimus "hundredth." Related: Infinitesimally.

updated on November 20, 2015

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Definitions of infinitesimal from WordNet
1
infinitesimal (n.)
(mathematics) a variable that has zero as its limit;
2
infinitesimal (adj.)
infinitely or immeasurably small;
Synonyms: minute
From wordnet.princeton.edu, not affiliated with etymonline.