A more thorough explanation:

A bachelor is a man who is not married. It can also refer to the first degree that a person receives after graduating from a university. In English law, it can refer to a member of one of the orders of chivalry, such as the Order of the Bath. A knight bachelor is also called a bachelor.

• John is a bachelor and enjoys living alone.
• Sarah received her bachelor's degree in psychology from the University of California.
• William was knighted and became a member of the Order of the Bath, making him a bachelor.

The first example illustrates the first definition of bachelor, which refers to an unmarried man. The second example illustrates the second definition of bachelor, which refers to the first degree that a person receives after graduating from a university. The third example illustrates the third definition of bachelor, which refers to a member of one of the orders of chivalry, such as the Order of the Bath.