in ‧ ter ‧ po ‧ late /ɪnˈtɜːpəleɪt $ -ɜːr-/ BrE AmE verb [transitive] formal
[ Date: 1600-1700 ; Language: Latin ; Origin: past participle of interpolare 'to polish up, change, make worse' ]
1 . to put additional words into a piece of writing SYN insert
2 . to interrupt someone by saying something
—interpolation /ɪnˌtɜːpəˈleɪʃ ə n $ -ˌtɜːr-/ noun [uncountable and countable]