a degree awarded by a graduate school or department, usually to a person who has completed at least one year of graduate study.
Also called mas·ter's.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
late 14c., originally a degree giving one authority to teach in a university; from master (n.) in its general sense of "man of learning" (early 13c.), "a teacher" (c.1200).
Online Etymology Dictionary, © 2010 Douglas Harper