The distance from one side of something to the other; or the wide range of something, like knowledge or experience.
Formed in Middle English from “broad” plus the noun suffix “-th,” like “warm” and “warmth.” It turned the idea of being broad into a measurable quality.
“Breadth of knowledge” treats your mind like a physical space that can be wide or narrow. The word still carries that map‑like feeling: you don’t just know things deeply, you know them across a wide area.
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