  For any finite-dimensional Lie bialgebra $g$, we construct a bialgebra
$A_{u,v}(g)$ over the ring $C[u][[v]]$, which quantizes simultaneously the
universal enveloping bialgebra $U({g})$, the bialgebra dual to $U(g^*)$, and
the symmetric bialgebra $S(g)$. We call $A_{u,v}(g)$ a biquantization of
$S(g)$. We show that the bialgebra $A_{u,v}(g^*)$ quantizing $U(g^*)$,
$U(g)^*$, and $S(g^*)$ is essentially dual to the bialgebra obtained from
$A_{u,v}(g)$ by exchanging $u$ and $v$. Thus, $A_{u,v}(g)$ contains all
information about the quantization of $g$. Our construction extends Etingof and
Kazhdan's one-variable quantization of $U(g)$.
