iota

 
Pronunciation: /ʌɪˈəʊtə/

noun

  • 1the ninth letter of the Greek alphabet (Ι, ι), transliterated as ‘i’.
  • (Iota) [followed by Latin genitive] Astronomy the ninth star in a constellation: Iota Piscium
  • 2 [in singular, usually with negative] an extremely small amount: nothing she said seemed to make an iota of difference

Origin:

from Greek iōta. iota (sense 2) arose because iota is the smallest letter of the Greek alphabet: compare with jot