balance of power
US /ˈbæl.əns əv ˈpaʊ.ər/
UK /ˈbæl.əns əv ˈpaʊ.ər/
1.
a situation in which the strength of rival nations or alliances is approximately equal, preventing any one entity from dominating the others
:
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The Cold War era was characterized by a delicate balance of power between two superpowers.
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Maintaining a regional balance of power is crucial for stability.
2.
the power held by a small group or party in a parliament that is needed to form a government or pass legislation
:
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The smaller party held the balance of power in the coalition government.
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With their votes, they could shift the balance of power in parliament.