Emily Dickinson Lexicon

JOT, n. [Gr. ιωτα, Ch. Heb. yod, Syr. yudh, the name of the letter י or i.]

An iota; a point; a tittle; the least quantity assignable. Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law till all shall be fulfilled. – Matth. v. A man may read much, and acquire not a jot of knowledge or be a jot the wiser. – Anon.