1 [countable] the number of times something happens, or the number of examples of something within a particular period of time
a rising birth rate
a dramatic fall in the city’s murder rate
rate of: The animals were dying at a rate of three an hour.
rate of: areas where the rate of unemployment is high
success rate: Their success rate in recruiting new staff is very high.
a high/low rate of something: There is a high rate of muggings and other forms of street crime in the area.
Synonyms and related words