How is the term "sender" best defined?

The term "sender" is best defined as the individual who initiates a message. In the communication process, the sender is responsible for formulating and conveying the message to the receiver. This role is critical because the effectiveness of communication often hinges on how well the sender can express their thoughts and intentions.

In this context, the sender must also consider the audience and choose appropriate language and tone to ensure that the message is received and understood as intended. The other terms provided refer to different aspects of communication: the receiver interprets the message, the communication medium is the channel through which the message is sent, and the group discussing the message represents interactive communication. Thus, understanding the sender's role is foundational to grasping the overall communication dynamics.