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[ahy-oh-tuh] /aɪˈoʊ tə/
a very small quantity; jot; whit.
the ninth letter of the Greek alphabet (I, ι).
the vowel sound represented by this letter.
Origin of iota
1600-10; < Latin iōta < Greek iôta < Semitic; compare Hebrew yōdh yod
1. bit, particle, atom, grain, mite. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for iota
Contemporary Examples
Historical Examples
  • Of business ability, Burton had never possessed one iota, and his private affairs were constantly mis-managed.

  • There was not an iota of stinginess in his habitual economy.

    The Printer Boy. William M. Thayer
  • The revolutionist ought without cease to develop every iota of his energy; he must deepen and broaden it; but this demands time.

    Mother Maksim Gorky
  • One would not detract an iota from the achievements of these gallant adventurers.

    Policing the Plains R.G. MacBeth
  • Then, after staggering and trembling, the iota came on an even keel.

    Danger! and Other Stories Arthur Conan Doyle
British Dictionary definitions for iota


the ninth letter in the Greek alphabet (Ι, ι), a vowel or semivowel, transliterated as i or j
(usually used with a negative) a very small amount; jot (esp in the phrase not one or an iota)
Word Origin
C16: via Latin from Greek, of Semitic origin; see jot
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for iota

"very small amount," 1630s, figurative use of iota, ninth and smallest letter in the Greek alphabet. Modern use is after Matt. v:18 (see jot), but iota in classical Greek also was proverbially used of anything very small. The letter name is from Semitic (cf. Hebrew yodh).

Online Etymology Dictionary, © 2010 Douglas Harper
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iota in Medicine

iota i·o·ta (ī-ō'tə)

Symbol ι The ninth letter of the Greek alphabet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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iota in Technology

language, specification
A specification language.
["The Iota Programming System", R. Nakajima er al, Springer 1983].

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Idioms and Phrases with iota


The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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