How to say "coefficient" in Japanese

• 係数けいすうCommon
  nounThe common word for 'coefficient' in its basic mathematical sense — the number multiplying a variable or term — and the one learners should use by default.
• 数係数すうけいすう
  nounA less common word for 'coefficient'; unless you are translating a text that itself uses it, 係数 is the natural choice in mathematical writing.
• 達率たつりつ
  noun (suffix)A less common word that really means 'rate'; although it is also glossed 'coefficient', it is seldom the word you want for the mathematical coefficient — choose 係数 instead.
• 仮数かすう
  nounMeans 'significand' or 'mantissa'; its 'coefficient' sense is that number as the multiplier in scientific notation, so for the ordinary algebraic coefficient use 係数.

For the ordinary mathematical coefficient use 係数; 数係数 is a less common alternative; 達率 really denotes a rate; 仮数 means significand or mantissa, its 'coefficient' sense being confined to scientific notation.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 係数けいすうcoefficient
• 数係数すうけいすうcoefficient
• 達率たつりつcoefficient
• 仮数かすうsignificand