infinitesimal

== English == === Etymology === From New Latin īnfīnītēsimus +‎ -al. Displaced earlier coordinate term fluxion. === Pronunciation === IPA(key): /ˌɪnfɪnɪˈtɛsɪməl/ Rhymes: -ɛsɪməl === Adjective === infinitesimal (comparative more infinitesimal, superlative most infinitesimal) Incalculably, exceedingly, or immeasurably minute; vanishingly small. (mathematics, not comparable) Of or pertaining to non-zero quantities whose magnitude is less than any positive rational number. (informal) Very small. ==== Synonyms ==== See also Thesaurus:tiny ==== Antonyms ==== infinite enormous ==== Derived terms ==== ==== Translations ==== === Noun === infinitesimal (plural infinitesimals) (mathematics) A non-zero quantity whose magnitude is smaller than any positive number (by definition it is not a real number). Antonym: infinity Something infinitesimally small. ==== Derived terms ==== infinitesimal calculus infinitesimally ==== Translations ==== === References === == Spanish == === Pronunciation === IPA(key): /infinitesiˈmal/ [ĩɱ.fi.ni.t̪e.siˈmal] Rhymes: -al Syllabification: in‧fi‧ni‧te‧si‧mal === Adjective === infinitesimal m or f (masculine and feminine plural infinitesimales) infinitesimal ==== Derived terms ==== === Further reading === “infinitesimal”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025