奇数(きすう)

きすう
noun
odd number
1. odd number
An integer that is not divisible by two, such as 1, 3, 5, 7, etc.
奇数(きすう)か偶数(ぐうすう)かを判定(はんてい)する。
I determine whether it's an odd or even number.
3は奇数(きすう)で、4は偶数(ぐうすう)だ。
3 is an odd number, and 4 is an even number.
奇数(きすう)の日(ひ)だけゴミを出(だ)せる。
Trash can only be put out on odd-numbered days.

奇数(きすう) means odd number — any integer not divisible by two (1, 3, 5, 7, etc.). The kanji 奇(き) means "strange/unusual" and 数(すう) means "number."

ANTONYM:

  • 偶数(ぐうすう): even number

COMMON PATTERNS:

  • 奇数(きすう)の日(ひ): odd-numbered days
  • 奇数(きすう)月(がつ): odd-numbered months (January, March, etc.)
  • 奇数(きすう)番号(ばんごう): odd-numbered

RELATED MATH TERMS:

  • 自然数(しぜんすう): natural number
  • 整数(せいすう): integer
  • 素数(そすう): prime number
  • 分数(ぶんすう): fraction

CULTURAL NOTE:
Odd numbers are traditionally considered lucky in Japan (吉数(きっすう)). Gift money (祝儀(しゅうぎ)) is typically given in odd-numbered amounts (10,000, 30,000, 50,000 yen).

Related Words

Antonym: 偶数(ぐうすう) (even number)
general
Added 2026.2.3 11:58 · Revised 2026.4.4 12:56
09500/09634_kisuu