  The quasi two-dimensional magnetic BaNi$_{2}$V$_{2}$O$_{8}$ is studied by
using high-resolution thermal expansion in magnetic fields up to 10 T applied
along the c-axis. A slight increase of about 1 % of the three-dimensional
antiferromagnetic ordering temperature $T_N$ is observed at 10 T. Positive and
negative pressure dependencies of $T_N$, respectively, are inferred from the
thermal expansion $\alpha(T)$ for pressures applied along the $a$- and
$c$-axes.
