a master's degree (the graduate academic degree awarded after completing a graduate program).
彼女は修士を取得してから研究職に就いた。
She obtained a master's degree and then took a research position.
修士課程で三年間勉強した。
I studied for three years in the master's program.
修士論文の締切が来月に迫っている。
The deadline for the master's thesis is approaching next month.