insert (v.) Look up insert at
"to set in, put or place in," 1520s, from Latin insertus, past participle of inserere "to graft, implant," from in- "in" (see in- (2)) + serere "attach, join; arrange, line up," from PIE *ser- (3) "to line up" (see series). Middle English had inseren "to set in place, to graft, to introduce (into the mind)" (late 14c.), directly from the Latin verb. Related: Inserted; inserting.
insert (n.) Look up insert at
"something inserted," 1893, especially a paper, etc., placed in among the pages of a newspaper, magazine, etc., from insert (v.).