noun
natural rate of increase; rate of natural increase
Demographic term for the difference between birth and death rates, excluding migration. Used in statistics and population studies.
日本の自然増加率は近年マイナスになっている。
Japan's natural rate of increase has become negative in recent years.
人口増加率 includes migration, while 自然増加率 excludes it.
Compound of 自然 (natural) + 増加 (increase) + 率 (rate).