An academic degree higher than a bachelor's degree but lower than a doctor's degree WordNet 3.0 & Open English WordNet

A master's degree is a postgraduate academic degree awarded by universities or colleges upon completion of a course of study demonstrating mastery or a high-order overview of a specific field of study or area of professional practice. Wikipedia

A postgraduate or sometimes undergraduate degree in the specified discipline Wikipedia Disambiguation

Postgraduate academic degree Wikidata

A degree that provides a mastery or high-order overview of a relevant field of study or area of professional practice. Its graduates possess a range of academic and vocational skills including advanced knowledge of a specialist body of theoretical and applied topics; high order skills in analysis, critical evaluation and/or professional application; and the ability to solve complex problems and think rigorously and independently within the area studied. OmegaWiki

A postgraduate degree which aims to assist students in developing a mastery for a particular academic field or profession. Wiktionary

Postgraduate degree. Wiktionary (translation)