Insertion
WordNet
noun
(1) The act of putting one thing into another
(2) A message (spoken or written) that is introduced or inserted
"With the help of his friend's interpolations his story was eventually told"
"With many insertions in the margins"
WiktionaryText
Noun
- The act of inserting, or something inserted.
- The distal end of attachment of a muscle to a bone that will be moved by the muscle.
- The addition of a nucleotide to a chromosome by mutation