Definition of 赤 (あか)
あか
                        赤
あか
aka
Common word
noun
1.
red, crimson, scarlet
2.
red-containing colour (e.g. brown, pink, orange)
3.
Red (i.e. communist)(colloquialism)(often written as アカ)
Other readings:
                紅【あか】
、朱【あか】
、緋【あか】[1]
                Notes:
                - word containing out-dated kanji
 
Related Kanji
| 赤 | red | 
| 紅 | crimson, deep red | 
| 朱 | vermilion, cinnabar, scarlet, red, bloody | 
| 緋 | scarlet, cardinal |