Interlineation

n. writing inserted between the lines in a document or text (esp. in a contract); addition to a contract that was made after it was signed and must be initialed by both parties in order to be valid (Legal)

Interlineation is a legal term that signifies a sentence that is newly inserted between previous sentences in a contract both parties had agreed upon previously. Interlineations help clarify specific points of a legal contract, and are useful if some of the terms of a contract become unclear later. Interlineations are typically initialed and dated, so as to make a record of changes and agreements to a particular contract.
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(n.)
The act of interlining.
  

(n.)
That which is interlined; a passage, word, or line inserted between lines already written or printed.
  

An addition of something to a document after it has been signed. Such additions are ignored unless they are initialed by the signatories and, if applicable, witnesses (eg. wills). - (read more on Interlineation)
  

interlineation /'intə,lini'eiʃn/
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