Translation guide
In Japanese, the word for 'coefficient' is 係数 (けいすう). This is a technical term used in mathematics, physics, and engineering. For everyday English uses like 'coefficient of friction' or 'correlation coefficient', the same word applies. There are no common alternative translations, but learners should be aware of related terms like 率 (りつ) for 'rate' or 'ratio' in some contexts.
A number or factor multiplying a variable or expressing a relationship between quantities.
係数 is specifically a coefficient (a constant factor in a term), while 率 often means 'rate' or 'ratio' (e.g., 成長率 growth rate, 利率 interest rate). Do not confuse them. In some compound words, 率 may translate to 'coefficient' in English (e.g., 吸収率 absorption coefficient), but 係数 is the safer, more general choice.
The standard term for 'coefficient' in mathematics, physics, and engineering. Used in expressions like 摩擦係数 (friction coefficient) and 相関係数 (correlation coefficient).
Please find the coefficient in this equation.
The coefficient of friction depends on the surface roughness.