  A general formulation is developed to demonstrate that atomic autoionizing
(AI) resonances are broadened and shifted significantly due to plasma effects
across bound-free continua. The theoretical and computational method presented
accounts for broadening mechanisms: electron collisional, ion microfields
(Stark), thermal Doppler, core excitations, and free-free transitions. {\it
Extrinsic} plasma broadening redistributes and shifts AI resonance strengths
while broadly preserving naturally {\it intrinsic} asymmetries of resonance
profiles. Integrated oscillator strengths are conserved as resonance structures
dissolve into continua with increasing electron density. As exemplar, the
plasma attenuation of photoionization cross sections computed using the
R-matrix method is studied in neon-like Fe~XVII in a critical range $N_e =
10^{21-24}$cc along isotherms $T = 1-2 \times 10^6$K, and its impact on
Rosseland Mean opacities. The energy-temperature-density dependent cross
sections would elicit and introduce physical features in resonant processes in
photoionization, \eion excitation and recombination. The method should be
generally applicable to atomic species in high-energy-density (HED) sources
such as fusion plasmas and stellar interiors.
