noun The process by which an organism produces others of its kind; breeding, propagation, procreation, reproduction.
noun The act of increasing, rising, or proliferating; augmentation, amplification, enlargement, escalation, aggrandizement. In particular, the spread (proliferating) of biochemical, nuclear and other weapons of mass destruction to countries not originally involved in developing them.
noun In particular, the spread (proliferating) of biochemical, nuclear and other weapons of mass destruction to countries not originally involved in developing them.
noun The result of building up; buildup, accretion.