The definition of a footnote is additional information or references that are printed at the bottom of the page, or something that is an afterthought.
(noun)To footnote is defined as to include additional information or references at the bottom of the page.
(verb)When you put a notation in the text that tells the reader that more information is found at the bottom of the page, and then you include a little note with information or references at the bottom of the page, this is an example of a time where you footnote.
See footnote in Webster's New World College Dictionary
noun
transitive verb footnoted, footnoting
See footnote in American Heritage Dictionary 4
noun
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