UNIT

I. noun Etymology: back-formation from ~y Date: 1570 1. the first and least natural number ; one , a single quantity regarded as a whole in calculation, a determinate quantity (as of length, time, heat, or value) adopted as a standard of measurement: as, an amount of work used in education in calculating student credits, an amount of a biologically active agent (as a drug or antigen) required to produce a specific result, 3. a single thing, person, or group that is a constituent of a whole, a part of a military establishment that has a prescribed organization (as of personnel and materiel), a piece or complex of apparatus serving to perform one particular function, a part of a school course focusing on a central theme, a local congregation of Jehovah's Witnesses, a small molecule especially when combined in a larger molecule , an area in a medical facility and especially a hospital that is specially staffed and equipped to provide a particular type of care , II. adjective Date: 1839 being, relating to, or measuring one ~