What is the meaning of "roger" in radiotelephony?

In radiotelephony, the term "roger" specifically means "I have received all of your last transmission." This response is significant because it confirms to the sender that their entire message has been understood without needing further clarification. Communications in aviation and other critical fields rely on clear and concise information exchange, and affirming completion of a message helps prevent miscommunication.

The other options represent different meanings in radiotelephony that are not accurately captured by "roger." For instance, "I have received your request for information" would suggest a prompt for more details rather than an acknowledgment of a complete message. Similarly, "please repeat" indicates a lack of understanding or incomplete information, which "roger" does not convey. Finally, "your message is unclear" implies a need for clarification, again contrary to the clear affirmation that "roger" signifies. Understanding these distinctions is crucial for effective communication in aviation operations.