(ないせん)

ないせん
noun
extension (phone), internal line
1. phone extension, internal line
An internal telephone line within an organization, or the extension number used to reach a specific phone.
内線(ないせん)番号(ばんごう)何番(なんばん)ですか。
What is your extension number?
内線(ないせん)担当者(たんとうしゃ)(つな)ぎます。
I'll connect you to the person in charge via the internal line.
Business context
内線(ないせん)1234(ばん)にかけてください。
Please call extension 1234.
2. civil war, internal conflict
A war or armed conflict within a country.
その(くに)(なが)内線(ないせん)(くる)しんだ。
That country suffered through a long civil war.
内線(ないせん)()わった(あと)(くに)復興(ふっこう)(はじ)まった。
After the civil war ended, the country's reconstruction began.
内線(ないせん)により(おお)くの人々(ひとびと)国外(こくがい)()げた。
Many people fled the country due to the civil war.

USAGE: 内線(ないせん) most commonly refers to telephone extensions in offices and organizations. The second meaning (civil war) is used in historical and political contexts.

COMMON PATTERNS:

  • 内線(ないせん)番号(ばんごう) (extension number)
  • 内線(ないせん)電話(でんわ)する (to call on the internal line)
  • 内線(ないせん)XXXX(ばん) (extension number XXXX)

CONTRAST:

  • 内線(ないせん) - internal line (within organization)
  • 外線(がいせん) - external line (outside calls)