Why do pilots say, "Roger"? What does Roger mean in aviation?

Roger is a current radiotelephony ‘proword’ which is a word used to represent a longer phrase.

Roger means, very specifically: “your message has been received and understood.”

Wilco means: “your message has been received and understood and I will comply.”

Affirm (note, NOT affirmative) simply means yes, but is clearer over the radio.

Negative means no.

Over means I’ve finished speaking and expect a reply.

Out means I’ve finished speaking and do NOT expect a reply.

Roger Wilco over and out means I am not a pilot.

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