Question

A leaf has veinlets parallel to each other. But, the veinlets are not parallel to the midrib. Can the leaf be considered to have a parallel venation?

Answer 1

No.
Veins run parallel to one another from the base to the tip of the leaf in parallel venation.
Veins are arranged in a net-like pattern on both sides of the midrib in reticulate venation.

So it is not parallel venation. It is reticulate venation.