noun U.S. Government.
a high-level rank, Grade 16, 17, or 18, in the federal civil service.
a government employee having such a rank.
of, relating to, or characteristic of such a rank or employee.
- supergiant star,
- supergranulation cell,
Origin of supergrade
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019