What is dissipation factor tan?

Some articles on dissipation factor, tan, factor, dissipation factor tan:

Ceramic Capacitor - Electrical Characteristics - ESR, Dissipation Factor, and Quality Factor
... losses of a capacitor may be specified either as equivalent series resistance (ESR), as dissipation factor(DF, tan δ), or as quality factor (Q), depending on the application requirements for the ... capacitors are mostly specified with the dissipation factor tan δ ... The dissipation factor is determined as the tangent of the reactance - and the ESR, and can be shown as the angle δ between imaginary and the impedance axis in the above vector diagram ...

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