Japanese symbol for “spacetime”

時空

じくう

Romaji: jikuu

space-time; spacetime

In Japanese, spacetime is 時空, read じくう (jikuu).

Before using these characters for a tattoo, check them with a native speaker. Dictionary words often have several meanings, and the right choice depends on context.

Meanings

n space-time; spacetime (physics)

Kanji and stroke order

時

time, hour

on: ジ
kun: とき、-どき

10 strokes · JLPT 4

空

empty, sky, void

on: クウ
kun: そら、あ.く、あ.き、あ.ける

8 strokes · JLPT 4

Related words

Words that share a kanji.

Word	Reading	Meaning
時間	じかん jikan	time
時代	じだい jidai	period; epoch; era
時期	じき jiki	time; season; period
当時	とうじ touji	at that time; in those days
一時	いちじ ichiji	one o'clock
同時	どうじ douji	same time
空気	くうき kuuki	air; atmosphere
空港	くうこう kuukou	airport

Data: JMdict (CC BY-SA 4.0); KANJIDIC2 (CC BY-SA 4.0); KanjiVG (CC BY-SA 3.0); wordfreq (CC BY-SA 4.0 (data)). Retrieved 2026-10-22.