1) the system of weights used, before metrication, in most English-speaking countries (1 pound = 16 ounces), used for all goods except precious metals and stones, and medicines (avoirdupois)

2) the system of ranks in society (class)

3) the system of human communication of knowledge, ideas, feelings etc using sounds and words (language)

4) the system of methods used, e.g. in academic study (methodology)

5) the system (code) for sending signals, e.g. by using one's arms or flags held in the hands, with various positions for the letters of the alphabet (semaphore)

6) the system in which people live together in organized communities; an organization of people with a particular interest or purpose (society)

7) (in the USSR) an elected council at local, regional or national level forming part of the system of government (soviet)