1. (mathematics) a variable that has zero as its limit;

1. infinitely or immeasurably small;

- Example: "two minute whiplike threads of protoplasm"

- Example: "reduced to a microscopic scale"

[syn:

The Collaborative International Dictionary of English v.0.48:

Infinitesimal \In`fin*i*tes"i*mal\, a. [Cf. F. infinit['e]simal, fr. infinit['e]sime infinitely small, fr. L. infinitus. See Infinite, a.] Infinitely or indefinitely small; less than any assignable quantity or value; very small. [1913 Webster] Infinitesimal calculus, the different and the integral calculus, when developed according to the method used by Leibnitz, who regarded the increments given to variables as infinitesimal. [1913 Webster]The Collaborative International Dictionary of English v.0.48:

Infinitesimal \In`fin*i*tes"i*mal\, n. (Math.) An infinitely small quantity; that which is less than any assignable quantity. [1913 Webster]WordNet (r) 3.0 (2006):

infinitesimal adj 1: infinitely or immeasurably small; "two minute whiplike threads of protoplasm"; "reduced to a microscopic scale" [syn: infinitesimal, minute] n 1: (mathematics) a variable that has zero as its limitMoby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "infinitesimal": atomic, corpuscular, embryonic, evanescent, germinal, granular, impalpable, imperceptible, imponderable, inappreciable, indiscernible, intangible, invisible, microcosmic, microscopic, molecular, subatomic, tenuous, thin, ultramicroscopic, unseeable