n. king; supreme ruler of any kind; a king’s guidance, guiding light as though led by a king

Alduin, feyn do jun, kruziik vokun staadnau, voth aan bahlok wah diivon fin lein!
Alduin, Bane of Kings, ancient shadow unbound, with a hunger to swallow the world!
(Book, Songs of Skyrim)

Pogaan nahlaas, vokrii wah jun.
Many alive, restored to (the) light.
(Paarthurnax, 000D2CF5)

Kendov krif ok kosiil Vokul, nuz jun Gaar niin nau ok hokoron.
The warrior fights his inner evils, but the king unleashes them on his enemies.
(Word Wall for Gaar, Cyclone)

A person with supreme rule to whom all loyalty is owed. May also refer to a king’s guidance (‘light’), not ‘light’ as in ‘sunlight’ or ‘light armor’.

Usage as meaning ‘light’ is likely a typo of kun ‘light’.