Sentence:  Three seconds flat is the usual time , and the space is crossed by moderate mileage , while the overwhelming immensity of such journeys must be conceived as a static pulsation through an enormous number of coexistent <WSD>frequencies</WSD> which perpetuate all events . 
Meaning of the word marked with <WSD> tags:  the ratio of the number of observations in a statistical category to the total number of observations