Prophecize isn't a word. I have not claimed to be a prophet. A prophet is a specific area of ministry/vocation. To exercise the gift of prophecy means to speak the Word of God with boldness. Elijah was a prophet who prophesied. He looked at Ahab and boldly proclaimed what God told him to say. I do not have direct personal revelation, but the Spirit has worked within me to boldly proclaim the Word of God towards given situations. Vocationally, I do not claim to be a prophet. But I do claim the gift of prophecy.
Can you define what this gift entails?
Sure it is. They used it in The Matrix. So there! What more authority could you ask for which for?