What does iota mean?
Iota is a formal and literary noun with two especially familiar uses. In its principal everyday sense, it means an extremely small or negligible quantity, often in phrases expressing the complete absence of something: there was not an iota of evidence, doubt, or hesitation. The expression can also suggest that something is too slight to matter or be detected. Iota is also the name of the ninth letter of the Greek alphabet, written ι in lowercase and Ι in uppercase, a usage found in linguistics, mathematics, and related technical subjects. In some electrical and mathematical contexts, it can represent the imaginary unit. The word is uncommon in casual conversation but remains useful in formal writing because it gives emphasis to the idea of a vanishingly small amount without relying on ordinary words such as “bit” or “little.”
A very small or negligible amount.
"He showed not an iota of remorse."
Literary and formal; commonly used in negative constructions to emphasize the absence of a quality.
The ninth letter of the Greek alphabet, represented by ι in lowercase and Ι in uppercase.
"The instructor began the lesson with the Greek letter iota."
A specialized use in languages, alphabet studies, and related fields.
A technical symbol for the imaginary unit, the square root of −1.
"The calculation uses iota to represent the square root of negative one."
Used in some mathematical and electrical contexts; notation varies by field and convention.
The plural iotas is used when referring to multiple instances or occurrences of the letter or the word.
"The chart includes several iotas from different manuscripts."
Iota began as a Greek letter and later became a tiny word for an almost nonexistent amount.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does iota come from?
English iota comes through Latin iota, the Latin form of the Ancient Greek name for the ninth letter of the Greek alphabet, iōta. The deeper origin of the Greek letter name is uncertain. The English sense meaning an infinitesimal quantity is traditional and is associated with the use of a single letter to indicate an extremely small amount.
Related word forms
How iota is actually used
As a term for a tiny amount, iota is literary and formal, usually conveying that the quantity is effectively nonexistent. In technical writing, its use as the name of a Greek letter is separate from the familiar sense of an insignificant amount.