Merriam-Webster Collegiate Dictionary - insert

 I. verb  Etymology: Latin ~us, past participle of inserere, from in- + serere to join — more at series  Date: 1529  transitive verb  1. to put or thrust in ~ the key in the lock ~ a spacecraft into orbit  2. to put or introduce into the body of something ; interpolate ~ a change in a manuscript  3. to set in and make fast; especially to ~ by sewing between two cut edges  4. to place into action (as in a game) ~ a new pitcher  intransitive verb of a muscle to be in attachment to the part to be moved  Synonyms: see introduce  • ~er noun  II. noun  Date: circa 1889 something that is ~ed or is for ~ion; especially written or printed material ~ed (as between the leaves of a book)