su•per•gradePronunciation: (sOO'pur-grād"), [key]
—n. U.S. Govt.
a high-level rank, Grade 16, 17, or 18, in the federal civil service.
a government employee having such a rank.
of, pertaining to, or characteristic of such a rank or employee.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.