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]

U.S. Gazetteer (1990):

Iota, LA (town, FIPS 37410)
  Location: 30.32650 N, 92.49480 W
  Population (1990): 1256 (527 housing units)
  Area: 3.3 sq km (land), 0.0 sq km (water)
  Zip code(s): 70543

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