Latin fissio

← Proto-Indo-European *bʰeyd- (root)

← Latin findō (affix)

← Latin -tiō (affix)

→ Spanish fisión (borrowed)

→ French fission (borrowed)

→ Italian fissione (borrowed)

→ Norwegian Bokmål fisjon (derived)

→ Norwegian Nynorsk fisjon (derived)

→ Portuguese fissão (borrowed)