footnote - definition and synonyms

noun [countable] 

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/ˈfʊtˌnəʊt/
singularfootnote
pluralfootnotes
  1. 1
    a note at the bottom of a page that gives more detailed information about something on the page
  2. 2
    an additional fact, event, or comment that is not very important

    Just as a footnote, it is worth saying that the whole project didn’t cost local taxpayers a single penny.