foot·note

[foot-noht] noun, verb, foot·not·ed, foot·not·ing.
noun
1.
an explanatory or documenting note or comment at the bottom of a page, referring to a specific part of the text on the page.
2.
a minor or tangential comment or event added or subordinated to a main statement or more important event.
verb (used with object)
3.
to add a footnote or footnotes to (a text, statement, etc.); annotate: to footnote a dissertation.

Origin:
1835–45; foot + note

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
footnote (ˈfʊtˌnəʊt) [Click for IPA pronunciation guide]
 
n
1.  a note printed at the bottom of a page, to which attention is drawn by means of a reference mark in the body of the text
2.  an additional comment, as to a main statement
 
vb
3.  (tr) to supply (a page, book, etc) with footnotes

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Footnote is one of our favorite verbs.
So is hornswoggle. Does it mean:
to steal or take dishonestly (money, esp. public funds, or property entrusted to one's care); embezzle.
to swindle, cheat, hoodwink, or hoax.
Etymonline
Word Origin & History

footnote
1841, from foot + note.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Molnar's research is now a fascinating footnote waiting to be pushed forward by
  other researchers.
He either succeeds, and achieves immortality in his profession, or becomes a
  blameworthy historical footnote.
There's one melancholy footnote to this whole story.
Fox may be the footnote to what could be the real story.
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