  We present a unified approach which is accurate at all temperatures and
densities for calculating the energy loss from a stellar plasma due to the
plasma process, the decay of photons and plasmons into neutrino pairs. To allow
efficient numerical calculations, an analytic approximation to the dispersion
equations for photons and plasmons is developed. It is correct to order
$\alpha$ in the classical, degenerate, and relativistic limits for all momenta
$k$ and is correct at small $k$ for all temperatures and electron densities.
Within the same approximations, concise expressions are derived for the
transverse, longitudinal, and axial vector components of the neutrino
emissivity.
