noun a single thing or person.
2. unit ·noun the least whole number; one.
3. unit ·noun a gold coin of the reign of james i., of the value of twenty shillings.
4. unit ·noun a single thing, as a magnitude or number, regarded as an undivided whole.
5. unit ·noun 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.