(epidemiology) The percentage of people who have tested positive out of all of those who have been tested (for a given pathogen).

(finance) A benchmark interest rate, from which other interest rates are calculated, policy rate / (UK) Especially, the interest rate at which the Bank of England lends money to commercial banks.

The change in strain (deformation) of a material with respect to time.

To subject (a good) to no value-added tax when sold (but the supplier can still recover VAT attributable to it).

present participle of zero-rate

(Internet marketing) A measure used by marketers as an indication of how many people "view" or "open" the electronic mail they send out.

Frequency or rate of accidents.

(crime, law enforcement) The proportion of crimes that are solved by the police with respect to the total number of crimes reported.

At half the usual rate; half-price.

A scheme or ploy made to attract a larger audience for usually mass media, like radio, television or digital streaming.