1. Noun, Noun which may take the genitive case particle 'no'

   red; crimson; scarlet

   信号機が赤の間は道路を渡るな。

2. Noun

   red-containing colour (e.g. brown, pink, orange)

3. Red (i.e. communist)

   Colloquialoften written as アカ

4. red light (traffic)

   Abbreviationsee 赤信号

5. red ink (i.e. in finance or proof-reading); (in) the red

   Abbreviationsee 赤字see 赤字

6. Noun which may take the genitive case particle 'no'

   complete; total; perfect; obvious

   see 赤の他人

7. Noun

   copper

   Abbreviationsee 銅see あかがね・1

8. red 5-point card

   HanafudaAbbreviationsee あかたん

Also written 紅【あか】aka、朱【あか】aka、緋【あか】aka