What term refers to a relationship or agreement involving two parties?

The term "bilateral" specifically refers to something that involves or affects two parties. In various contexts, such as agreements, negotiations, or treaties, bilateral arrangements indicate that both sides have mutual interests or responsibilities. This term is often used in political, economic, and social discussions to highlight the cooperation or coordination required between two entities.

For example, in trade agreements between two countries, "bilateral" signifies that the terms and conditions are directly negotiated and agreed upon by both nations involved, ensuring that each party's needs and concerns are addressed. This highlights the fundamental aspect of mutuality inherent in bilateral relationships, distinguishing it from terms that suggest more complex arrangements involving multiple parties or broader interactions.