i

used of a single unit or thing; not two or more

“`ane' is Scottish”

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)

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”

the 9th letter of the Roman alphabet