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