Balanced
来自Big Physics
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Middle English (in balance (sense 3 of the noun)): from Old French balance (noun), balancer (verb), based on late Latin (libra) bilanx ‘(balance) having two scale pans’, from bi- ‘twice, having two’ + lanx ‘scale pan’.
etymonline
balanced (adj.)
1590s, "in equilibrium," past-participle adjective from balance (v.). In reference to meal, diet, etc., by 1908.