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English definition of “insertion”

insertion

noun     /ɪnˈsɜː.ʃən/ US  /-ˈsɝː-/
[U] the act of putting something inside something else, or adding something, especially words to something else: Scientists hope that the insertion of normal genes into the diseased cells will provide a cure.Inserting and forcing things into other things [C] something you put inside something else or something, especially words that you add to something else: Any editorial insertions you make should be enclosed in square brackets.Inserting and forcing things into other things
(Definition of insertion noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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