Commentary: Charge per unit, amount of a charge or payment relative to some basis
A ten-minute phone call at that rate would cost five dollars.
This airline offers reduced rates for seniors.
WordNet 2.0 Sense Numbers: 1
Commentary: A magnitude or frequency relative to a time unit, also the relative speed of progress or change
The unemployment rate doubled last year.
They traveled at a rate of 55 miles per hour.
The rate of change was faster than expected.
He works at a great rate.
Her heart rate was racing after she finished the mile run.
WordNet 2.0 Sense Numbers: 2 3