Word
Kana: ちきゅう Romaji: chikyuu Level: N3

地球

Meaning in English

Earth, planet Earth

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Illustrated Dictionary
地球 - Illustrated Dictionary
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What it means

It means the planet Earth: the spherical astronomical body that supports life and is the home of human societies; the term refers to Earth as a physical object in space and as the global system (environment, atmosphere, biosphere) discussed in science, geography and everyday speech.

Main meanings

  • the physical globe or model representing Earth used in education or display
  • the Earth seen as a global system or scale, often in phrases about worldwide phenomena
  • a technical term in astronomy and geology distinguishing Earth from other planets
  • a figurative sense referring to the human world or global society

How to use it

Used across registers from casual conversation to formal writing: common in news and everyday talk when referring to Earth or global issues, in scientific and educational contexts for astronomy, geology and environmental science, and as a base in compound technical terms indicating global scale.

Variants and close terms

  • 世界 (sekai) — world, the human or cultural world
  • 地球儀 (chikyuugi) — physical globe, terrestrial globe
  • 地表 (chihyō) — Earth's surface
  • 宇宙 (uchuu) — space, universe (related concept)

Composition

  • 地 (chi) — ground, earth, land (the basic notion of 'ground' or 'soil')
  • 球 (kyuu) — sphere, ball (a round object)

Origin

The compound entered Japanese through Sino-Japanese vocabulary and became standard in modern scientific and educational usage during the late 19th century when Western astronomy and translations introduced modern planetary terms into Japanese; it replaced older cosmological expressions in technical contexts.

Word class

noun (名詞)

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