Which of the following best defines conversation?

The definition that most accurately describes conversation is the informal exchange of ideas by spoken words. This choice captures the essence of what conversation is all about: a casual interaction where individuals communicate, share thoughts, opinions, and information verbally. Conversations often occur in everyday settings and can involve a variety of topics without the need for a formal structure or extensive planning.

In contrast, other definitions provided, such as a formal discussion of ideas, relate more closely to structured debates or meetings that may lack the informal, spontaneous nature of conversation. Similarly, an extensive written exchange of letters suggests a correspondence style of communication that is quite different from the immediate back-and-forth characteristic of spoken interaction. Lastly, the definition involving a debate structured around specific rules implies a more competitive and formal setup, which is also distinct from the free-flowing nature of a typical conversation. Thus, the chosen definition aligns best with the common understanding of how conversations function in daily life.