one-hitter
— Noun
– English
~ a game in which a pitcher allows the opposing team only one hit
one
— Noun
– English
~ a single person or thing; "he is the best one"; "this is the one I ordered"
one-fifth
— Noun
– English
~ one part in five equal parts
one-off
— Noun
– English
~ a happening that occurs only once and is not repeated
one-millionth
— Noun
– English
~ one part in a million equal parts
one million million million
— Noun
– English
~ the number that is represented as a one followed by 18 zeros; "in England they call a quintillion a trillion"