To insert in a writing; introduce, as a word or phrase not in the original text; especially, to foist in: introduce surreptitiously, as what is spurious or unauthorized.To alter, as a book or manuscript, by insertion of new matter; introduce new words or phrases into; especially, to corrupt or vitiate by spurious insertions or additions.In mathematics and physics, to introduce, in a series of numbers or observations (one or more intermediate terms), in accordance with the law of the series; make the necessary interpolations in: as, to interpolate a number or a table of numbers.To carry on with intermissions; interrupt or discontinue for a time.To interpose; place in an intermediate position.