1. Conjunction

   that is (to say); namely; i.e.; or

   Usually written using kana alone

   彼は非常に知識のある人、すなわち生き字引である。

2. precisely; exactly; just; nothing but; neither more nor less

   Usually written using kana alone

3. if one does ..., then; in that case; then

   Usually written using kana aloneas ...ば～; indicates that what follows is a natural consequence

4. so; accordingly; thereupon; then

   Usually written using kana alone

Also written 則ち【すなわち】sunawachi、乃ち【すなわち】sunawachi