- unit
- 1570, "single number regarded as an undivided whole," alteration of unity on the basis of digit. Popularized in John Dee's Eng. translation of Euclid, to express Gk. monas (Dee says unity formerly was used in this sense). Meaning "single thing regarded as a member of a group" is attested from 1642. Extended sense of "a quantity adopted as a standard of measure" is from 1738. Sense of "group of wards in a hospital" is attested from 1893.