"frequency" in the noun sense
1. frequency, frequence, oftenness
the number of occurrences within a given time period
"the frequency of modulation was 40 cycles per second"
"the frequency of his seizures increased as he grew older"
2. frequency, relative frequency
the ratio of the number of observations in a statistical category to the total number of observations
3. frequency, absolute frequency
the number of observations in a given statistical category
Source: WordNet® (An amazing lexical database of English)
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