The word 'insert' started as a scribe's tool. When it entered English in the late 15th century, it referred specifically to placing additional text into a manuscript or document — a precise technical operation in an age when written records were legal instruments. The Latin source, inserere, combined in- (into) and serere (to join or bind), a verb that also generated 'series' (things joined in sequence), 'serial' (in a series), 'assert' (to join oneself to a claim), and 'dissertation' (a joining together of arguments). Latin actually had two verbs spelled serere: one meaning 'to sow' (giving us 'season' and 'seminar') and another meaning 'to join.' Only the joining sense feeds into 'insert,' though the two verbs were often confused even by Roman writers. The physical meaning — pushing a key into a lock, inserting a coin into a slot — developed later, as did the noun form, which appeared in the 19th century for printed material placed inside a newspaper or magazine. In computing, the INSERT key and SQL INSERT command carry forward the original scribal sense of adding content to an existing structure.