master's degree

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An academic degree conferred by a college or university upon those who complete at least one year of prescribed study beyond the bachelor's degree.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an academic degree higher than a bachelor's degree but lower than a doctor's degree