内線
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Noun for an internal telephone line within an organization. Often used in business settings, e.g., 『内線で電話する』 (naisen de denwa suru, 'call by extension').
Theme

In a busy office, User is a new employee learning the phone system from their colleague, Tanaka.

内線

ないせん

phone extension

Culture & SocietyWork & Business

Memory Hook

Think of an 'extension' cord inside a phone system. 'Inside line' → 『内線』 (naisen, 'phone extension'). 'Nai' (inside) + 'sen' (line) — like a line within the office.

Cultural Note

In Japanese offices, 『内線』 (naisen, 'phone extension') is commonly used for internal calls. You might hear phrases like 『内線番号』 (naisen bangou, 'extension number') when contacting colleagues without dialing an outside line.

Forms

Base: 内線Noun for an internal telephone line within an organization. Often used in business settings, e.g., 『内線で電話する』 (naisen de denwa suru, 'call by extension').