A person or device that centers something, or an object designed to help position something in the exact middle.
From 'center' (from Latin centrum meaning 'middle point') plus the agent suffix '-er' indicating one who performs an action. The word emerged in English as mechanization required tools and people to precisely position objects.
Centerers are crucial in manufacturing—a precision centerer can mean the difference between a perfect wheel and one that wobbles dangerously. It's why identical bolts spinning true is possible at all.
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