Webster's Revised Unabridged Dictionary · 1913

Iota

Iota , noun

[Latin, from Greek 'iw^ta. See Jot.]

1.
The ninth letter of the Greek alphabet (ι) corresponding with the English i.
2.
A very small quantity or degree; a jot; a particle.
They never depart an iota from the authentic formulas of tyranny and usurpation. — Burke
Collocations (1)
Iota subscript (Greek Grammar) , iota written beneath a preceding vowel, as a,, h,, w,, -- done when iota is silent.