パイ

See also: ハイ, バイ, and Appendix:Variations of "pai"

Japanese

Pronunciation

Etymology 1
パイ (pai): a pear pie.

From English pie.[1][2][3]

Noun

パイ • (pai) 

  1. a pie (type of pastry)

Etymology 2
パイ (pai): an example of the mathematical constant pi.

From English pi,[1][2] ultimately from Ancient Greek πεῖ (peî).

Noun

パイ • (pai) 

  1. (mathematics) pi
    Synonyms: (for circles) 円周率 (enshūritsu), (for mathematical products) 相乗積 (sōjōseki)
Usage notes

In Japanese mathematics notation, lower-case π is used to represent the constant of the ratio of the circumference of a circle to its diameter (3.14159265...). Upper-case Π is used to represent a product of a multiplication operation.

References
  1. Matsumura, Akira, editor (2006), 大辞林 [Daijirin] (in Japanese), Third edition, Tōkyō: Sanseidō, →ISBN
  2. Kindaichi, Kyōsuke et al., editors (1997), 新明解国語辞典 [Shin Meikai Kokugo Jiten] (in Japanese), Fifth edition, Tōkyō: Sanseidō, →ISBN
  3. Shōgaku Tosho (1988) 国語大辞典（新装版） [Unabridged Dictionary of Japanese (Revised Edition)] (in Japanese), Tōkyō: Shogakukan, →ISBN
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