From Longman Dictionary of Contemporary Englishinsertionin‧ser‧tion /ɪnˈsɜːʃən $ -ɜːr-/ AWL noun 1 [uncountable]PUT the act of putting something inside something else2 [countable]TCADD something that is added to the middle of a document or piece of writingFrom Longman Business Dictionaryinsertionin‧ser‧tion /ɪnˈsɜːʃən-ɜːr-/ noun1[countable, uncountable] when you add something new to a piece of writing, or the words that you addWhat effect will the insertion of this clause have?2[countable]MARKETING another name for an INSERTThe group plans to put its views across through insertions in the daily press.3[countable]MARKETING an occasion when an advertisement appears in a newspaperThe Guitarist’s Readers’ Ads service averages over five hundred separate insertions per month.