Unit is a versatile term with multiple meanings depending on context:
1. In mathematics: A single thing or person regarded as an individual part of a larger whole
2. In measurement: A standard quantity used to express physical measurements (e.g., meter, kilogram)
3. In military: A military organization consisting of soldiers
4. In real estate: An individual apartment or house in a larger building
5. In education: A module or section of a course
6. In business: A department or division of a company