1. (n.) A single thing or person.

2. (n.) The least whole number; one.

3. (n.) A gold coin of the reign of James I., of the value of twenty shillings.

4. (n.) Any determinate amount or quantity (as of length, time, heat, value) adopted as a standard of measurement for other amounts or quantities of the same kind.

5. (n.) A single thing, as a magnitude or number, regarded as an undivided whole.