Farad n. : The standard unit of electrical capacity; the capacity of a condenser whose charge, having an electro-motive force of one volt, is equal to the amount of electricity which, with the same electromotive force, passes through one ohm in one second; the capacity, which, charged with one coulomb, gives an electro-motive force of one volt.

Example:
How do I know what Farad power capacitor should I get?

Taxonomy
capacitor, capacitance, farad capacitor, pF, picofarad, values, nF, free encyclopedia, types of capacitors, microfarad, voltage, puff, Google Books, capacitance unit, unit of capacitance, volt, coulomb, nanofarad.

Defination from the web:
... of Farads (F), microfarads (μF or MFD), nanofarads (nF), or picofarads (pF), as one, millionths, billionths or trillionths of a farad.[2] The ... The 'farad' should not be confused with the faraday, an old unit of charge nowadays superseded by the coulomb. ...