What is "prepend"

"ponder, consider," 1560s, from pre- + Latin pendere "to weigh" (see pendant). Related: Prepended; prepending.

Etymology 1 vb. (context computing linguistics transitive English) To attach (an expression, phrase, etc.) to another, as a prefix. Etymology 2

vb. (context rare transitive English) To premeditate; to weigh up mentally.