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]