内線 (Naisen) is a Japanese noun meaning “phone extension, indoor wiring, inner line”.
Meanings
- nounphone extension; indoor wiring; inner line
Examples
内線４５番をお願いします。
Extension 45, please.
内線２１４に出る人なら誰でも構いません。
I'll speak to anyone at extension 214.
Sentences from Tatoeba (CC BY 2.0 FR).