Interlineation is a legal term that signifies writing has been inserted between earlier language.  It is commonly used to indicate the insertion of new language between previous sentences in a contract, though it may also be used in other contexts.  For example, interlineations can help to clarify specific points of a legal contract, and are useful if some of the terms of a contract become unclear later. They are typically initialed and dated, so as to make a record of changes and agreements to a particular contract.
- Black's Law Dictionary interlineation (9th ed. 2009).
- 71 C.J.S. Pleading § 437 ("Mode of making amendment—By interlineation"); 3B C.J.S. Alteration of Instruments § 87.
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