Where does “adverbium” come from?

adverbium (Danish) comes from Latin adverbium, from Latin Ad, from Latin illic, from Latin ille, from Latin olle, from Proto-Italic *olnos — that.

adverbium (Danish): adverb

Definitions

Step	Language	Word	Meaning
1	Latin	adverbium	adverb
2	Latin	Ad	toward, to
3	Latin	illic	he, she, it, yonder, that, overthere; in that...
4	Latin	ille	that; those; "; demonstrative pronoun "; that...
5	Latin	olle	Archaic form of ille
6	Proto-Italic	*olnos	that