v.tr. 1 a insert (words) in a book etc., esp. to give false impressions as to its date etc. b make such insertions in (a book etc.). 2 interject (a remark) in a conversation. 3 estimate (values) from known ones in the same range. interpolation n. interpolative adj. interpolator n.
[ L interpolare furbish up (as INTER-, polire POLISH(1)) ]