interpolation in WordNet English dictionary

1. 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"
   interpolation  insertion 
   
2. the action of interjecting or interposing an action or remark that interrupts
   interjection  interposition  interpolation  interpellation 
   
3. (mathematics) calculation of the value of a function between the values already known
   interpolation