回線(かいせん)

かいせん
noun
line, circuit, connection
technicalelectronics
See also: 海鮮(かいせん) (seafood)
1. line, circuit, connection
A telecommunications or internet line; the physical or virtual connection used for data transmission or phone calls.
回線(かいせん)が混(こ)んでいてつながらない。
The line is congested and I can't get through.
光回線(ひかりかいせん)に切(き)り替(か)えたら速度(そくど)が上(あ)がった。
Speed improved after switching to a fiber-optic line.
災害時(さいがいじ)は電話回線(でんわかいせん)がパンクして、連絡(れんらく)が取(と)れなくなることがある。
During disasters, phone lines can become overloaded and it may become impossible to reach people.

Usage

回線(かいせん) is used for both telephone lines and internet connections. It is a common term in everyday life when discussing internet service, phone contracts, or network issues.

Common collocations

  • 光回線(ひかりかいせん) (fiber-optic line)
  • 電話回線(でんわかいせん) (telephone line)
  • 回線(かいせん)速度(そくど) (line speed)
  • 回線(かいせん)が混(こ)む (the line is congested)
  • 回線(かいせん)を契約(けいやく)する (to contract a line/connection)

Watch out

Not to be confused with 海鮮(かいせん) (seafood), which has the same reading.

Related Words

Related: ネットワーク (network)
Compare: 通信網(つうしんもう) (communications network)
general
Added 2026.2.13 21:38 · Revised 2026.9.2 13:01
11000/11094_kaisen