Incunabulum is a noun. It's origins are Latin. It is a book
printed before 1501. In the plural, incunabula, it means early
stages, beginnings, or infancy.
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incunabulum.
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It is any book printed before the year 1501.
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Incunabulum is the word for anything printed before 1501. The
plural is incunabula. I don't think I've ever seen the word in
print in the singular, outside a dictionary.