The Collaborative International Dictionary
duplicative
duplicative \du"pli*ca*tive\, a.
Having the quality of duplicating or doubling.
(Biol.) Having the quality of subdividing into two by natural growth. ``Duplicative subdivision.''
--Carpenter.
Douglas Harper's Etymology Dictionary
duplicative
1870; see duplicate (v.) + -ive.
Wiktionary
duplicative
a. of, related to, or being a duplicate
Usage examples of "duplicative".
The question becomes how much overlap or redundancy between land, sea, air, and space forces can the nation afford, and what is the opportunity cost to the core competency of the land, sea, air, or space force that builds and/or maintains the duplicative force structure.
Many more are inaccessible to him at present, but it's been noted that he's again modified and extended the duplicative processes.