leksikonet is the neuter singular definite of leksikon.

leksikonN

Kven

leksikoniN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:43837Edit on GitHub Suggest

leksikonN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:18965Edit on GitHub Suggest

Case	Sg	Pl
Indef	leksikon	leksika / leksikon
Def	leksikonet	leksikaene / leksikona