This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of interpolate.

adj. Inserted in, or added to, the original; introduced; foisted in; changed by the insertion of new or spurious matter.

adj.

adj. Provided with necessary interpolations.

adj. Introduced or determined by interpolation.

"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."

introduced   

interpolate