What does master mean?

1. Used as a courtesy title for men in ancient times.

In the past, scholars or teachers were called.

The loser said, "What is your master's life?" -"Mozi Lost".

May the master help me with my ambition and teach me to understand. -"Mencius Hui Liang Wang Shang".

In the past, I called my husband.

Master accumulates knowledge, and when he "knows his death", he will be virtuous. -Biography of Women in the Later Han Dynasty

4. Address people who read ancient books and have stale ideas (including satire).

5. The names of Confucius students.