Definition of side note in English:

side note

noun

  • A marginal note in a text.

    • ‘In one of the books on American cooking, there was a side note on eggs.’
    • ‘At first, it had been a side note, it had been a sentence on a page of a textbook.’
    • ‘Therefore, all side notes appear in the margins in their original format.’
    • ‘Side-notes are usually set in type three or four sizes smaller than that of the text.’
    • ‘An interesting side note is found on the second last page of the book.’