The phrases ATC may use for issuing a clearance fills a very large manual called Joint Order 7110.65, Air Traffic Control. Many ATC phrases are also defined in the Aeronautical Information Manual. It would be impossible to define every phrase in a single page on this website. Sometimes, you may know the definition of a phrase but remain unsure about how it applies to your flight.
Please use the search box below to look up the phrase or word. If a search of ATCcommunication.com does not produce a satisfactory answer, please email me, Jeff, at Jeff@ATCcommunication.com and I’ll do my best to answer your question.