Other forms: footnotes; footnoted; footnoting
A footnote is a short bit of extra information that's printed at the bottom of a book's page. Some footnotes cite the authors and titles of the sources the author consulted while researching and writing.
The presence of footnotes usually means you're reading an academic or scholarly work of nonfiction. Your history paper might include footnotes on each page, noting the books, journals, and websites you used for your research. Some contemporary novels have footnotes as well, a complex and playful way for the author to insert extra notes and details. The foot of a page is the bottom, which explains the word footnote.
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