Class

1. A group of students or alumni who have the same year of graduation. The class of 2012 has graduated.
2. A group of students who meet at a regularly scheduled time to study the same subject. The English class meets every weekday at 10 A.M.
3. A grade of mail. We sent the package by first class.
4. A quality of accommodation on public transport. Many people cannot afford to fly first class.
5. A social stratum whose members share certain economic, social, or cultural characteristics. The lower-income classes generally have less educational opportunities.