'变量' (biàn liàng) literally means 'changing quantity': 变 (biàn) means 'to change', and 量 (liàng) means 'quantity' or 'measure'. Together, they form a technical term used primarily in mathematics and computer programming to refer to a symbolic name that represents a value which can change during calculation or program execution. Unlike constants, variables hold values that may be updated, reassigned, or computed dynamically.

This word is standard in STEM education and professional contexts in Chinese—used in algebra (e.g., solving for x), programming (e.g., declaring int count = 0), and data analysis. It appears frequently in textbooks, coding tutorials, and technical documentation. While the characters individually have broader meanings, in this compound, 变量 is almost exclusively technical and rarely used in everyday non-technical speech.