adj. dead
adv. in a dead or death-like manner
n. the dead; someone who is dead
v. to die, kill, make or become dead

So, it is done. Alduin dilon. The Eldest is no more, he who came before all others, and has always been.
(Paarthurnax, 0009C20B)

Qiilaan us dilon!
[Bow before (the) dead!]
(Draugr, 0004C5A1)

Permanently dead, or no longer living. Can be used to describe the undead.

Shares root with diil ‘undead’, dilos ‘deadly’, and dinok ‘death’.

Generally use krii 'to kill' or dir 'to die' instead of dilon as a verb.