What is the meaning of "over" in aviation communication?

In aviation communication, the term "over" signifies that the transmission is complete and the sender expects a response from the receiving party. This term is important for clear and effective communication, as it helps avoid misunderstandings about when a message has ended and when the other party should respond.

Using "over" indicates that the speaker has finished their message and is awaiting acknowledgment or reply, which is essential in a field where clarity and precision can impact safety. In contrast, the other choices imply different meanings: for instance, saying that the transmission is interrupted or switching off the radio contradicts the notion of awaiting a response, and indicating that a message needs to be repeated does not align with the purpose of concluding a transmission.