Definitions
1.nounThe process by which an organism produces others of its kind; breeding, propagation, procreation, reproduction.
2.nounThe act of increasing or rising; augmentation, amplification, enlargement, escalation, aggrandizement.
3.nounThe result of building up; buildup, accretion.
4.nounThe spread of biochemical, nuclear and other weapons of mass destruction to countries not originally involved in developing them.