Monthly salary; the amount of pay received each month (bonuses or allowances may be treated separately).
新入社員の月給は会社の規定に従って決まる。
The monthly salary for new employees is determined according to the company's rules.
月給制か時給制かで働き方が変わることがある。
Working conditions can vary depending on whether it's a monthly salary or hourly wage system.
彼は月給が上がったので引っ越すことにした。
His monthly salary went up, so he decided to move.