• Noun: the smallest whole number or a numeral representing this number; examples: "he has the one but will need a two and three to go with it", "they had lunch at one"
• Noun: a single person or thing; examples: "he is the best one", "this is the one I ordered"
• Adj: used of a single unit or thing; not two or more; example: "`ane' is Scottish"
• Adj: having the indivisible character of a unit; examples: "a unitary action", "spoke with one voice"
• Adj: of the same kind or quality; example: "two animals of one species"
• Adj: used informally as an intensifier; example: "that is one fine dog"
• Adj: indefinite in time or position; examples: "he will come one day", "one place or another"
• Adj: being a single entity made by combining separate components; example: "three chemicals combining into one solution"
• Adj: eminent beyond or above comparison; examples: "matchless beauty", "the team's nonpareil center fielder", "she's one girl in a million", "the one and only Muhammad Ali", "a peerless scholar", "infamy unmatched in the Western world", "wrote with unmatchable clarity", "unrivaled mastery of her art"