noun
: the ratio of the number of neutrons produced in a nuclear pile to the number disappearing that must equal or exceed unity for a chain reaction to take place — called also reproduction constant, reproduction factor
noun
: the ratio of the number of neutrons produced in a nuclear pile to the number disappearing that must equal or exceed unity for a chain reaction to take place — called also reproduction constant, reproduction factor
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012