A more thorough explanation:

MAN

1. An adult male.
2. Humankind. Also termed mankind.
3. A human being.
4. Historically, a vassal or feudal tenant.

The term "man" can refer to different things depending on the context. It can mean an adult male, which is a person who identifies as male and has reached adulthood. It can also refer to humankind, which includes all humans regardless of gender. For example, "Man has made great advancements in technology." It can also simply mean a human being, regardless of gender. Finally, in a historical context, it can refer to a vassal or feudal tenant, which was a person who held land from a lord and owed them loyalty and military service.

• John is a man who works as a doctor.
• Man has always been fascinated by the stars.
• Every man has the right to pursue happiness.
• In medieval times, a man would swear loyalty to his lord in exchange for land.

The first example illustrates the definition of "man" as an adult male. The second example illustrates the definition of "man" as humankind. The third example illustrates the definition of "man" as a human being. The fourth example illustrates the historical definition of "man" as a vassal or feudal tenant.