The Collaborative International Dictionary of English v.0.48:

Iota \I*o"ta\, n. [L., fr. Gr. 'iw^ta. See Jot.]
   [1913 Webster]
   1. The ninth letter of the Greek alphabet ([iota])
      corresponding with the English i.
      [1913 Webster]

   2. [from iota being the smallest letter in the Greek
      alphabet.] A very small quantity or degree; a jot; a
      particle.
      [1913 Webster +PJC]

            They never depart an iota from the authentic
            formulas of tyranny and usurpation.   --Burke.
      [1913 Webster]

   Iota subscript (Gr. Gram.), iota written beneath a
      preceding vowel, as a,, h,, w,, -- done when iota is
      silent.
      [1913 Webster]

WordNet (r) 3.0 (2006):

iota
    n 1: a tiny or scarcely detectable amount [syn: shred,
         scintilla, whit, iota, tittle, smidgen,
         smidgeon, smidgin, smidge]
    2: the 9th letter of the Greek alphabet

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "iota":
   ace, atom, bit, crumb, dab, dole, dot, dram, dribble, driblet,
   drop, droplet, dwarf, farthing, fleck, flyspeck, fragment, gnat,
   gobbet, grain, granule, groat, hair, handful, jot, little,
   little bit, microbe, microorganism, midge, minim, minimum, minutia,
   minutiae, mite, modicum, molecule, mote, nutshell, ounce, particle,
   pebble, pinch, pinhead, pinpoint, pittance, point, ray, scrap,
   scruple, smidgen, smitch, snip, snippet, speck, spoonful, spot,
   thimbleful, tiny bit, tittle, trifling amount, trivia,
   vanishing point, whit



The Free On-line Dictionary of Computing (30 December 2018):

Iota

    A specification language.

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

   (1994-12-08)


U.S. Gazetteer Places (2000):

Iota, LA -- U.S. town in Louisiana
   Population (2000):    1376
   Housing Units (2000): 583
   Land area (2000):     1.269242 sq. miles (3.287321 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.269242 sq. miles (3.287321 sq. km)
   FIPS code:            37410
   Located within:       Louisiana (LA), FIPS 22
   Location:             30.328500 N, 92.493123 W
   ZIP Codes (1990):     70543
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Iota, LA
    Iota