master; qualified worker; respectful form of address for older men; CL:個|个[ge4],位[wei4],名[ming2]

surname Shi

teacher; master; expert; model; army division; (old) troops; to dispatch troops

senior male fellow disciple or student (by seniority, not age); son of one's teacher who is older than oneself

senior female fellow student or apprentice; daughter (older than oneself) of one's teacher