Historically, the word main carried a significantly different primary meaning than it does in modern English, originating from the Old English noun mægen, which meant physical strength, bodily power, or brute force. Over subsequent centuries through the medieval and early modern periods, this meaning evolved from physical might to denote that which possesses the greatest power, size, or importance in a system. By the late Middle Ages, the term expanded further into maritime terminology to describe the open sea and industrial vocabulary to represent primary water or electrical trunk lines.
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