Definition from macmillandictionary.com
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a rising birth rate
a dramatic fall in the city’s murder rate
The animals were dying at a rate of three an hour.
areas where the rate of unemployment is high
Their success rate in recruiting new staff is very high.
There is a high rate of muggings and other forms of street crime in the area.
Doctors monitor the patient’s heart rate.
The population was growing at an alarming rate.
During this period the rate of inflation soared.
Workers were leaving at a rate of one a month.
plans to reduce the tax rates for people on low incomes
The banks now pay a lower rate of interest to savers.
They increased the hourly rate of pay to £8.50.
Well, I'm not going home on foot, at any rate.