The word "one" is a cardinal number that represents the total amount of a single unit or item. It is the integer that comes before two and after zero. In addition to its mathematical meaning, "one" can also refer to a singular person or thing, emphasizing uniqueness or individuality.
The word "one" originates from Old English "ān," which is related to the Proto-Germanic "ainaz" and the Proto-Indo-European root "oi-nə" meaning "one, unique."