1. Being a single unit, or entire being or thing, and no more; not multifold; single; individual. The dream of Pharaoh is one. Gen. xli. 25. O that we now had here But one ten thousand of those men in England. Shak. 2. Denoting a person or thing conceived or spoken of indefinitely; a certain. "I am the sister of one Claudio" [Shak.], that is, of a certain man named Claud...