/uy/ , n. , pl. I's or Is, i's or is .
1. the ninth letter of the English alphabet, a vowel.
2. any spoken sound represented by the letter I or i, as in big, nice, or ski.
3. something having the shape of an I.
4. a written or printed representation of the letter I or i.
5. a device, as a printer's type, for reproducing the letter I or i.