空中|くうちゅうkuuchuu[0]heiban (flat)

1. noun(in) the air; midair; sky
   煙けむりは空中くうちゅうへと舞い上まいあがった。↗

   The smoke ascended into the air.

• Synonym宙ちゅうNeutralRead 「ちゅう」. Covers midair but is mostly seen in 「宙に浮く」; it also means 'from memory, by heart', a sense 「空中」 does not have.
• Antonym地上ちじょうNeutralMeans on or above the ground; it stands opposite to 「空中」 when that refers to midair.
• Antonym地下ちかNeutralMeans underground; it stands opposite to 「空中」 when that refers to the sky above.

Use 「空中」 for the air or midair, as in 「空中ブランコ」. For hanging in midair or a matter left unsettled, say 「宙に浮く」. 「地上」 is the ground, 「地下」 underground.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 地面じめんから離はなれている空間くうかん。