  We report the observation of a "transparency window" in the dielectric
resonant absorption spectrum of the relaxor ferroelectric K1-xLixTaO3 (KLT) in
the vicinity of its weakly first order transition. This phenomenon is shown to
be conceptually similar to the electro-magnetically induced transparency (EIT)
phenomenon observed in atomic vapors, which can be modeled classically by a
driven master -slave oscillator system. In KLT, it reveals the presence of
macroscopic hetero-phase fluctuations and provides unique information on the
nature and mechanism of the phase transition in relaxors.
