Literary or classical term for balance or equilibrium, often in a metaphorical sense of weighing or judging. Rare in modern everyday language; more common words include バランス or 均衡.
Maintaining balance was emphasized in old political thought.
A borrowing from Classical Chinese 権衡: 権 is the movable weight of a steelyard, and 衡 its balance beam. Together they denote weighing, balance, or equilibrium.