| そ | 
|---|
| 遡 | 
| きゅ | う | 
|---|---|
| 及 | 
noun, takes する, intransitive verb
- retroactivity, retroaction, being retroactive (to).
Variations
| Pronunciation | Kanji | Kana | Is Common | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 
 
 | 遡及 | そきゅう | |||||||
| 
 
 | 遡及 | さっきゅう | |||||||
| 
 
 | 溯及 | そきゅう | |||||||
| 
 
 | 溯及 | さっきゅう | |||||||
| 
 
 | そ及 | そきゅう | |||||||
| 
 | そ及 | さっきゅう | 
Contained Kanji Breakdown
go upstream, retrace the past
さかのぼ.る ソ サク (11th)
conjunction (astronomy), first day of month, north
ついたち サク たち (Kentei Pre-1, N1)