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iota (n.)

"very small amount," 1630s, figurative use of iota, ninth and smallest letter in the Greek alphabet (corresponding to Latin -i-). Its use in this sense is after Matthew v.18 (see jot (n.), which is the earlier form of the name in English), but iota in classical Greek also was proverbially used of anything very small. The letter name is from Semitic (compare Phoenician and Hebrew yodh).

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Definitions of iota from WordNet

iota (n.)
a tiny or scarcely detectable amount;
Synonyms: shred / scintilla / whit / tittle / smidgen / smidgeon / smidgin / smidge
iota (n.)
the 9th letter of the Greek alphabet;
From wordnet.princeton.edu