More densely packed; having more mass or substance in the same space; also, more closely packed or harder to understand.
From Latin 'densus' meaning thick. The comparative form '-er' shows more density. Used both physically (matter) and abstractly (logic, writing).
A denser material might be heavier for its size, but denser writing is just harder to understand—the word travels from physics to reading, proving that 'thick' and 'hard to grasp' felt the same to ancient Romans.
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