1. A very small amount or quantity: This is the most common meaning. It comes from the Greek letter "iota" (ι), which is the smallest letter in the Greek alphabet. For example:
* "He didn't have an iota of evidence to support his claim."
* "There wasn't an iota of food left in the fridge."
2. A small amount of something: This is a more formal and literary way of saying "a little bit".
3. The ninth letter of the Greek alphabet: This meaning is less common and primarily used in academic contexts.
In summary: "Iota" generally refers to a minuscule amount, emphasizing its insignificance.