insertion

noun4

1. •
   The act of inserting, or something inserted.

   • The surgeon performed the insertion of a pacemaker.
   • The insertion of new text changed the meaning of the document.
2. •
   The addition of a nucleotide to a chromosome by mutation.
3. •
   The distal end of attachment of a muscle to a bone that will be moved by the muscle.
4. •
   The process of going from subcritical to prompt critical.