in·ter·lin·e·a·tion \ˌ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ˈāshən\noun Etymology: Medieval Latin interlineatus (past participle) + English -ion 1.: the act of interlining 2.: something interlined < interlineations in a later hand > < editorial interlineations > < a printed form with typewritten interlineations — New York Times >