Etymology
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footnote (n.)

also foot-note, in printing, "a note at the bottom of a page as an appendage to some part of the text," 1841, from foot (n.) "lower end of a document" (1660s) + note (n.). So called from its original position at the foot of a page. Also sometimes formerly bottom note. As a verb, from 1864. Related: Footnoted; footnoting.

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Definitions of footnote
1
footnote (v.)
add explanatory notes to or supply with critical comments;
Synonyms: annotate
2
footnote (n.)
a printed note placed below the text on a printed page;
Synonyms: footer
From wordnet.princeton.edu