This is from the study guide for the radio licence
Appendix B - Procedural Words and Phrases
Word or Phrase Meaning
ACKNOWLEDGE Let me know that you have received and understood this message.
AFFIRM An expression used in radiocommunication meaning "Yes."
BREAK Indicates the separation between portions of the message. (To be used where there is no clear distinction between the text and other portions of the message.)
CLEARED Authorized to proceed under the conditions specified.
CONFIRM Have I received the following ... or Did you receive the message?"
CORRECTION An error has been made in this transmission (or message indicated). The correct version is ....
DISREGARD Consider this transmission as not sent.
GO AHEAD Proceed with your message.
HOW DO YOU READ? What is the readability of my transmission?
I SAY AGAIN An expression used in radiocommunication meaning "I repeat for clarity or emphasis."
MAYDAY An expression meaning "I am in distress." It is the international radiotelephony distress signal. Preferably spoken three times, it indicates imminent and grave danger and means that immediate assistance is requested.
MAYDAY RELAY The spoken word for the distress relay signal.
MONITOR Listen (on frequency).
NEGATIVE No, or that is not correct, or I do not agree.
OUT Conversation is ended and no response is expected.
OVER My transmission is ended and I expect a response from you.
PAN PAN The international radiotelephony urgency signal. Preferably spoken three times, it indicates a condition that concerns the safety of an aircraft o ranother vehicle, or some person on board or within sight, but that does not require immediate assistance.
READ BACK Repeat all, or the specified part, of this message back to me exactly as received.
ROGER I have received all of your last transmission.
ROGER NUMBER I have received your message Number ________.
SAY AGAIN An expression used to request a repetition of the last transmission.
STANDBY I must pause for a few seconds or minutes. Please wait and I will call you.
SEELONCE International expression to indicate that silence has been imposed on the frequency due to a distress situation.
SEELONCE FEENEE International expression to indicate that the distress situation has ended.
SEELONCE MAYDAY An international expression to advise that a distress situation is in progress. The command comes from the station in control of the distress traffic.
WILCO Your instructions received, understood and will be complied with.
WORDS TWICE (a) As a request: Communication is difficult, please send each word, or group of words, twice;
(b) As information: Since communication is difficult, I will send each word, or group of words, twice.
Notice that "roger" "wilco" "over" "break" and "out" are all in there but "copy" and "break break" is not. I suspect that "copy" is not in there because it means the same thing as "roger" to most people. So you might as well just use "roger".
I find some people using "copy", when they really mean "wilco", as in:
Me: "Can you get the ramp crew to come out here and marshal us in?"
STOC: "copy"
