a wheeled vehicle that has two wheels and is moved by foot pedals | the relative speed of progress or change |
a single complete execution of a periodically repeated phenomenon | amount of a charge or payment relative to some basis |
a periodically repeated sequence of events | a quantity or amount or measure considered as a proportion of another quantity or amount or measure |
a series of poems or songs on the same theme | a magnitude or frequency relative to a time unit |
an interval during which a recurring sequence of events occurs | |
the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz) | |