noun
rate of increase; growth rate
Used in economic, statistical, or business contexts to describe the percentage or ratio by which something grows.
今年の売上の増加率は5%だった。
The sales growth rate this year was 5%.
伸び率 is a more general term for 'growth rate', often used interchangeably with 増加率 but can also refer to qualitative growth.
Compound of 増加 (increase) and 率 (rate).