notation
US /noʊˈteɪ.ʃən/
UK /noʊˈteɪ.ʃən/
1.
a series or system of written symbols used to represent numbers, amounts, or elements in something such as music or mathematics
:
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Musical notation helps musicians read and play songs.
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Scientific notation is used to express very large or very small numbers.
2.
a note or annotation
:
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He made a quick notation in the margin of the book.
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The professor added a critical notation to the student's essay.