subreplacement en · ADJ
Etymology
From sub- + replacement.
Meanings
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(not-comparable, of a birth rate) Below the level needed to maintain the current population.
The other is the fact that the population of Japan has begun to shrink, the result of years of subreplacement birth rates.
2011, James W. White, Mirrors of Memory: Culture, Politics, and Time in Paris and Tokyo, University of Virginia Press, →ISBN, page 219: