interpolation

Noun

• the action of interjecting or interposing an action or remark that interrupts

• (mathematics) calculation of the value of a function between the values already known

• 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
    

Related words

• Synonyms: 
  interjection , interposition , interpellation , insertion