- (uncountable) The act, process, method, or an instance of representing by a system or set of marks, signs, figures, or characters.
- (uncountable) A system of characters, symbols, or abbreviated expressions used in an art or science or in mathematics or logic to express technical facts or quantities.
- (countable) A specific note or piece of information written in such a notation.
- She made a in the margin of the book.
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