How to say "decimal" in Japanese

• デシマル
  nounA loanword that transcribes 'decimal' directly. It is less common and seldom the word you want: for the base-ten system say 十進, and for a decimal number or digit say １０進数.
• 十進じっしん
  prenominal modifierCovers 'decimal' as the name of the base-ten, or denary, number system — the system sense, as when decimal is contrasted with binary. For an individual decimal number or digit, １０進数 is the closer match.
• １０進数じっしんすう
  nounA noun for a decimal number, that is a number written in base ten; it also covers 'decimal digit'. The word to reach for when 'decimal' means a number, as in mathematics or computing.

Use 十進 for the base-ten system itself and １０進数 for a decimal number or digit, while 「デシマル」, a less common loanword, is seldom the word you want for any sense of 'decimal'.

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

• デシマルdecimal
• 十進じっしんdecimal
• １０進数じっしんすうdecimal