Postgraduate adj. Of, pertaining to, or designating, the studies pursued after graduation, esp., after receiving the bachelor's degree at a college; graduate. Note: Most careful writers consider the word graduate to be the proper word to use in this sense.
... waited, Loring's thoughts were busy with many things, friendly solicitude for the exile serving as the point of departure. He knew what a handfast friend might know: how Kent had finished his postgraduate course in the law and had succeeded to his father's small practice in the New Hampshire county town where he was born and bred. Also, he knew how Kent's friends, college friends who knew his gifts and ... — The Grafters • Francis Lynde
... tell you this," said President Roosevelt to this same young man: "You may have a small under-secretaryship; but let me tell you this," said he; "do not take it just yet. You are only out of college. Take a postgraduate course with the people. Get down to earth. See what kind of beings these Americans are. Find out ... — The Young Man and the World • Albert J. Beveridge