一いっ極きょく集しゅう中ちゅう

noun

overconcentration; excessive concentration in one place

Often used in socio-economic contexts, especially referring to the concentration of population, political power, and cultural institutions in Tokyo. Can also apply to other forms of heavy centralization.

• 東とう京きょうへの一いっ極きょく集しゅう中ちゅうが問もん題だいになっている。

  The overconcentration in Tokyo has become a problem.

• 一いっ極きょく集しゅう中ちゅうを是ぜ正せいするために地ち方ほう分ぶん散さんが進すすめられている。

  Decentralization is being promoted to correct the overconcentration.