Simple past tense and past participle of interpolate.(verb)
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Use "interpolated" in a sentence
"The young farmer in question possessed only a very elementary education, and had never been taught French, yet almost from the moment when he first began to speak he occasionally interpolated a French word in his conversation, and the practice extended as he grew older."
"Owing to M. VESQUIER's speaking such excellent English, it never occurred to me that he had suddenly interpolated the French word"
"Though Erasmus suspected the truth, that the verse had been interpolated from the Latin text, he added it in his third edition"