the ratio of the number of observations in a statistical category to the total number of observations

the number of occurrences within a given time period

the number of observations in a given statistical category

the audible part of a transmitted signal

a recording of acoustic signals

an audible acoustic wave frequency

the sound elements of television

of or relating to a method of teaching language that focuses on listening and speaking

(electronics) a graph of frequency response with signal amplitude or gain plotted against frequency

(electronics) a graph of frequency response with signal amplitude or gain plotted against frequency