The higher priesthood. Worthy young men enter at the age of 18 or 19. Mormons believe Peter, James, and John bestowed it on Joseph Smith and Oliver Cowdery in 1829. The offices of the Melchizedek priesthood are elder, seventy, high priest, and patriarch.
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.