Definitions for "Cumulative Audience"
is sometimes referred to as a station's reach and it is quite literally the number (in 000s) of different listeners in a target group reached by a station over a specified time period.
The number of different people who tune into a radio or TV channel in a given time period - often over a week. Same as reach. Sometimes abbreviated to cume.
The net (unduplicated) audience of a program over a given period of time.