Select the term that best matches the following description:

A person who believes that all human beings belong to a single global community, free from national or regional prejudices.

The correct option is Cosmopolitan.

Explanation:
A cosmopolitan is a person who believes that all human beings belong to a single global community, free from national, cultural, or regional prejudices.

To better understand the term, let's analyze the meaning of all the given options:

• Cosmopolitan: An individual who regards the world as their country and considers all people as fellow citizens of a unified world community.
• Xenophobe: A person who harbors prejudice, fear, or hatred toward foreigners or people from other countries.
• Chauvinist: A person showing excessive, aggressive, or fanatical support and loyalty towards their own country, gender, or group.
• Isolationist: A person who advocates for avoiding political, economic, or social involvement with other nations or communities.

Hence, the term that perfectly matches the given description is Cosmopolitan.