iota

Etymology

From Ancient Greek ἰῶτα (iôta), ultimately from Proto-Semitic *yad- (“hand”). Doublet of yodh. * (jot): In reference to a phrase in the New Testament: "until heaven and earth pass away, not an iota, not a dot, will pass from the Law" (Mt 5:18), iota being the smallest letter of the Greek alphabet.

noun

1. The ninth letter of the Greek alphabet.
   As a Greek numeral, iota represents ten.
   There are twelve iotas on that page.
2. A jot; a very small, insignificant quantity.
   His expression had not changed one iota except perhaps for an additional tightening of his lips. 1966, James Workman, The Mad Emperor, Melbourne, Sydney: Scripts, page 99
   [E]very iota of its gravitic power. 1982, John Cleve, Spaceways #7: The Manhuntress, page xviii. 194