I

i (http://definr.com/i)

     adj : used of a single unit or thing; not two or more; "`ane' is
           Scottish" [syn: one, 1, ane]
     n 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) [syn: iodine, iodin, I,
           atomic number 53]
     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" [syn: one, 1, I,
         ace, single, unity]
     3: the 9th letter of the Roman alphabet [syn: I]