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iota

[ahy-oh-tuh]
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noun
  1. a very small quantity; jot; whit.
  2. the ninth letter of the Greek alphabet (I, ι).
  3. the vowel sound represented by this letter.
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Origin of iota

1600–10; < Latin iōta < Greek iôta < Semitic; compare Hebrew yōdh yod

Synonyms

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1. bit, particle, atom, grain, mite.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for iota

iota

noun
  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 one or an iota)
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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

Word Origin and History for iota

n.

"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).

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Online Etymology Dictionary, © 2010 Douglas Harper

iota in Medicine

iota

(ī-ōtə)
n.
  1. The ninth letter of the Greek alphabet.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Idioms and Phrases with iota

iota

see not one iota.

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