i (Adjective) — Used of a single unit or thing; not two or more.
i (Noun) — The smallest whole number or a numeral representing this number.
i (Noun) — A nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks).
i (Noun) — The 9th letter of the Roman alphabet.
i (Pronoun) — Refers to the speaker or writer.