A line is a long, thin mark or path, like one drawn with a pencil or formed by people standing one after another. It can also mean a row of words, a boundary, or a series of connected things.
“Line” comes from Latin “līnea,” meaning “linen thread,” because early straight edges were made by stretching a tight string. Over time, the idea of a stretched thread turned into the geometric and drawn “line” we use today.
It’s mind‑bending that in math, a line has length but no thickness at all—something we can’t literally draw in the real world. Every “line” you see on paper is actually a strip pretending to be an infinitely thin idea.
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