Common LDS term denoting the power and authority of the priesthood. A man only has keys for his particular calling. For example, a bishop has keys (power and authority) in his ward but not in his stake. Mormons believe that Jesus has given the apostles all the keys necessary to govern the church.
Dictionary of Mormonese
Dictionary of "Mormonese"
Stop talking past each other. Gain a better understanding of the words that are unique to Mormonism and the differences of shared terms between Mormonism and Christianity.