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rivalry of local warlords; a number of powerful (talented, influential) persons standing by themselves in a given field
戦国時代は群雄割拠の混乱した時代であった。
The Sengoku period was a chaotic era of rival warlords.
群雄割拠の中から一人の英雄が現れた。
From among the rival warlords, one hero emerged.
IT業界は群雄割拠の様相を呈している。
The IT industry presents an aspect of fierce rivalry among many players.