rate

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rate

1. 
a. a price or charge with reference to a standard or scale
b. (as modifier): a rate card
2. a charge made per unit for a commodity, service, etc.
3. a wage calculated against a unit of time

rate

[rāt]
(science and technology)
The amount of change of some quantity during a time interval divided by the length of the time interval.
References in periodicals archive ?
A corresponding adjusted 5-year cohort rate (an extended-year rate) incorporates an additional year for students to graduate.
they are retained in a grade) before they drop out, these individuals were accounted for by the use of a cohort rate.
New Tech Network (NTN) today announced 95 percent annual graduation rates for its high school class of 2009-2010 with a four-year cohort rate of 85 percent, surpassing national rates by almost 20 percent in the same period.