tennisen is the masculine singular definite of tennis.

tennisN

Kven

tennisN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:10295Edit on GitHub Suggest

tennisN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:233989Edit on GitHub Suggest

Case	Sg	Pl
Indef	tennis	tenniser
Def	tennisen	tennisene