noun
Notes or comments written in the margins of a book or document
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The scholar meticulously studied the marginalia in the ancient manuscript.
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I love reading the little notes in the margins of old books, it's like a hidden treasure hunt.
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Check out the cool doodles and comments in the margins, that's some interesting marginalia!
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The artist used the white space around the painting as a form of marginalia, adding depth to the overall composition.