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