What is the defination for frequency

Resonance | Define Resonance at Dictionary.com (http://dictionary.reference.com/browse/resonance)

Frequency | Define Frequency at Dictionary.com (http://dictionary.reference.com/browse/frequency)

What is period

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In very general terms, applicable to almost every specialty, frequency is the repetition rate of a particular phenomenon per uniform unit of time (usually one second). The particular phenomenon is usually reduced to being described as one cycle. For example the number of oscillations of a radio transmitter (per second).