A person or device that balances things, maintains equilibrium, or keeps things in proportion or harmony.
From Middle English, derived from 'balance' plus the agent suffix '-er.' The concept of a device that balances dates back to ancient scales and seesaws.
The word 'balancer' applies to everything from a tight-rope walker to a robot maintaining its position—it's one of those words that captures a fundamental human skill we've mechanized and computerized.
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