insertion
US /ɪnˈsɝː.ʃən/
UK /ɪnˈsɝː.ʃən/

1.
the action of inserting something or the state of being inserted
:
•
The insertion of the new data into the database was successful.
•
Careful insertion of the needle is crucial for the procedure.
2.
a thing that is inserted
:
•
The newspaper contained a special advertising insertion.
•
The surgeon made a small insertion to access the organ.