Definition of: unit

(y′nit) noun
1. A single person or thing regarded as an individual but belonging to an entire group.
2. A body or group considered as a single whole among a plurality of similars.
3. A standard quantity with which others of the same kind are compared for purposes of measurement and in terms of which their magnitude is stated.
4. Math. A quantity whose measure is represented by the number 1; a least whole number; specifically, in arithmetic, the number 1 itself; unity.
5. Med. The quantity of a drug, vaccine, serum, or antigen required to produce a given effect.
6. A fundamental quantity used in calculating how much scholastic work a student has finished. [Short for UNITY]