ENGLISH. Phrases. This phrase can have two meanings, depending on the presence of the second noun. Essentially, to be "on par" is "to be on the same level as", or "to be equal to".

For instance I believe that action fuelled by ignorance is on par with hate crimes in terms of evil."

When the second noun is not there, it means to be at par - which (as described by the par node) is a nominal value.