Here are the most common radio terms:

AQH
An abbreviation for the Average Quarter Hour. It averages all dayparts to determine the number of persons listening to a particular radio station for at least five minutes during a 15-minute period.

Cume
Cume is the number of different persons who tune to a radio station during the course of a daypart for at least five minutes.

Daypart
Designated times during the day that are broken down into specific time periods in order to rank station listeners hip. For example, the morning drive daypart is 5:00 a.m. to 10:00 a.m.

Format
The type of programming a station broadcasts, i.e., adult contemporary, country, news, etc.

Gross Impressions
The audience reach or the number of “impressions” a spot had on listeners in all markets with all stations.