i meaning and definition

I noun

Definition of I (noun)

1. 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: atomic number 53, iodin, iodine
2. the smallest whole number or a numeral representing this number
   • "he has the one but will need a two and three to go with it"; "they had lunch at one"
   • synonyms: 1, ace, one, single, unity
3. the 9th letter of the Roman alphabet
4. the 9th letter of the Roman alphabet

I adjective

Definition of i (adjective)

1. used of a single unit or thing; not two or more
   • "`ane' is Scottish"
   • synonyms: 1, ane, one