Plain English Meaning
The specific way pilots and controllers are expected to talk to each other on the radio. Certain words and phrases have agreed-upon meanings, so a message means the same thing to everyone who hears it.
Full Definition
The standardized set of words, phrases, and procedural language used in radio communications between pilots and air traffic controllers. Standard phraseology is established by the FAA (primarily in the Aeronautical Information Manual and the Pilot/Controller Glossary) to ensure that every transmission carries a clear, unambiguous meaning that all parties interpret the same way.
Context Anchor
Used in radio communication, especially when receiving, repeating, or asking about an air traffic control clearance.