the English form of the Greek iota, i.e., the smallest letter of the Greek alphabet. The Hebrew is yod, or y formed like a comma ('). It is used metaphorically to express the minutest thing.
·noun An iota; a point; a tittle; the smallest particle. ·cf. <<Bit>>, ·noun. II. Jot ·vt To set do...
Webster's Dictionary of the English Language
Or Iota, the smallest letter of the Greek alphabet, used metaphorically or proverbially for the smal...
Easton's Bible Dictionary