Fromconcatenate +‎-ive.

concatenative (notcomparable)

1. Linked in aseries ororder of things depending on each other, as if linked together;successive.
   • 1961,Robert A. Heinlein,Stranger in a Strange Land, New York: Avon,→OCLC:

     In fact the titles could be anything – or (with some of the most puissant) no title at all, but they could all be identified as "flappers" by function: each one held arbitrary andconcatenative veto over any attempted communication from the outside world to the Great Man who was the nominal superior of the flapper.

2. Operating byconcatenation.

   concatenative synthesis

•  Concatenative programming language on Wikipedia.Wikipedia