[noun] [U] - (the use of) special marks that you add to a text to show the divisions between phrases and sentences, and to make the meaning clearerHis letter was completely without punctuation.Punctuation and spelling were never really taught at my school.A punctuation mark is a mark that you add to a text to show the divisions between different parts of it.Full stops/Periods, commas, semicolons, question marks and brackets are all different types of punctuation mark.
PUNCTUATION
Meaning of PUNCTUATION in English
Cambridge English vocab. Кембриджский английский словарь. 2012