刹那

From Middle Chinese 剎那 (MC tsrhaet na), a transliteration of Sanskrit क्षण (kṣaṇa).^[1][2]

Originally a Buddhist term meaning the smallest possible moment in time: a split-second. Carries favorable connotations of "precious" from the Buddhist teaching that one should live well even in the shortest moment of time.

This reading is now archaic and is falling into disuse.

• (Tokyo) せちな [séꜜchìnà] (Atamadaka – [1])
• IPA^(key): [se̞t͡ɕina̠]

刹(せち)那(な) • (sechina) 

1. see 刹(せつ)那(な) (setsuna) below

/setina/ → /setuna/

Shift in pronunciation from 刹(せち)那(な) (sechina) above, using the 慣(かん)用(よう)音(おん) (kan'yōon) of 刹(せつ) (setsu) for the first kanji.^[1]

This reading is now the most common.

• (Tokyo) せつな [séꜜtsùnà] (Atamadaka – [1])^[2]
• IPA^(key): [se̞t͡sɨna̠]

刹(せつ)那(な) • (setsuna) 

1. an instant, a moment
2. (Buddhism) the smallest unit of time, of varying lengths depending on tradition:
   1. roughly 0.11 seconds, defined as 1/65^th of a 弾(だん)指(し) (danshi), where a 弾(だん)指(し) (danshi) is 1/12,000^th of a day or 7.2 seconds
   2. 0.002 seconds, defined as 1/60^th of a 念(ねん) (nen), where a 念(ねん) (nen) is 1/60^th of a 弾(だん)指(し) (danshi)
   3. 1/75^th of a second, defined as 1/6,480,000^th of a day
3. (mathematics) by extension from the instant meaning, an extremely small number: 10^-18, atto-

刹(せつ)那(な) • (Setsuna) 

1. a female given name

• “刹那”, in 漢字ぺディア [Kanjipedia]‎^[1] (in Japanese), The Japan Kanji Aptitude Testing Foundation, 2015–2025

刹那 • (challa) (hangeul 찰나)

1. hanja form^? of 찰나 (“moment; instant”)

刹那

1. chữ Hán form of sát na (“split-second”)