supergrade

[soo-per-greyd]
noun U.S. Government.
  1. a high-level rank, Grade 16, 17, or 18, in the federal civil service.
  2. a government employee having such a rank.
adjective
  1. of, relating to, or characteristic of such a rank or employee.

Origin of supergrade

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018