rate

/reɪt/ n [C] (MEASUREMENT)

Definition

› a measurement of the speed at which something happens or changes, or the number of times it happens or changes, within a particular period: the rate of change/decay rates of digestion/oxygenation We have relatively low unemployment rates these days. If we improve students’ self-esteem, we could reduce the dropout rate.

(Definition of rate n (MEASUREMENT) from the Cambridge Academic Content Dictionary © Cambridge University Press)