  The Modified Newtonian Dynamics (MOND) and the Universal Rotation Curve (URC)
are two ways to describe the general properties of rotation curves, with very
different approaches concerning dark matter and gravity. Phenomenological
similarities between the two approaches are studied by looking for properties
predicted in one framework that are also reproducible in the other one. First,
we looked for the analogous of the URC within the MOND framework. Modifying in
an observationally-based way the baryonic contribution Vbar to the rotation
curve predicted by the URC, and applying the MOND formulas to this Vbar, leads
to a "MOND URC" whose properties are remarkably similar to the URC. Second, it
is shown that the URC predicts a tight mass discrepancy - acceleration
relation, which is a natural outcome of MOND. With the choice of Vbar that
minimises the differences between the URC and the "MOND URC" the relation is
almost identical to the observational one. This similarity between the
observational properties of MOND and the URC has no implications about the
validity of MOND as a theory of gravity, but it shows that it can reproduce in
detail the phenomenology of disk galaxies' rotation curves, as described by the
URC. MOND and the URC, even though they are based on totally different
assumptions, are found to have very similar behaviours and to be able to
reproduce each other's properties fairly well, even with the simple assumptions
made on the luminosity dependence of the baryonic contribution to the rotation
curve.
