verb (used with object), in·ter·po·lat·ed, in·ter·po·lat·ing.
verb (used without object), in·ter·po·lat·ed, in·ter·po·lat·ing.
Origin of interpolate
Word Origin for interpolate
1610s, "to alter or enlarge (a writing) by inserting new material," from Latin interpolatus, past participle of interpolare "alter, freshen up, polish;" of writing, "falsify," from inter- "up" (see inter-) + polare, related to polire "to smoothe, polish." Sense evolved in Latin from "refurbish," to "alter appearance of," to "falsify (especially by adding new material)." Middle English had interpolen (early 15c.) in a similar sense. Related: Interpolated; interpolating.