[in.sert] vb [L insertus, pp. of inserere, fr. in- + serere to join--more at series] vt (1529) 1: to put or thrust in "~ the key in the lock" "~ a spacecraft into orbit"
2: to put or introduce into the body of something: interpolate "~ a change in a manuscript"
3: to set in and make fast; esp: to insert by sewing between two cut edges
4: to place into action (as in a game) "~ a new pitcher" ~ vi, of a muscle: to be in attachment to the part to be moved syn see introduce -- in.sert.er n
[2]in.sert n (ca. 1889): something that is inserted or is for insertion; esp: written or printed material inserted (as between the leaves of a book)