a very small quantity; jot; whit.
the ninth letter of the greek alphabet (I, ι).
the vowel sound represented by this letter.

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. 2014.
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World English Dictionary
iota (aɪˈəʊtə)
1.  the ninth letter in the Greek alphabet (Ι, ι), a vowel or semivowel, transliterated as i or j
2.  (usually used with a negative) a very small amount; jot (esp in the phrase not oneoran iota)
[C16: via Latin from Greek, of Semitic origin; see jot]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1636, figurative use of iota, ninth and smallest letter in the Gk. alphabet, after Matt. v:18 (see jot). The letter name is from Heb. yodh.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Computing Dictionary

Iota definition

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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American Heritage
Idioms & Phrases


see not one iota.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
The film has some charm and a winning simplicity but not an iota of depth.
These people are so backward, and so full of hatred and bigotry, they do not
  deserve even one iota of our sympathy.
None of the comments here have even an iota of fault in them.
In my opinion none of those meals add an iota to living standards, unless there
  is no real food available.
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Idioms & Phrases
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