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)

• iodine
• iodin
• I
• atomic_number_53

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

• one
• 1
• I
• ace
• single
• unity

the 9th letter of the Roman alphabet

• I
• i

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

• `ane' is Scottish

• one
• 1
• i
• ane