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). Synonyms: iodine, iodin, atomic number 53.

(noun) the smallest whole number or a numeral representing this number. Synonyms: one, 1, ace, single, unity. Examples: "He has the one but will need a two and three to go with it." "They had lunch at one."

(noun) the 9th letter of the Roman alphabet. Synonyms: i.

(adj) used of a single unit or thing; not two or more. Synonyms: one, 1, i, ane. Example: "`ane' is scottish."