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Adjective
- used of a single unit or thing; not two or more
Noun
- the 9th letter of the Roman alphabet
- 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
- 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)