"Contemporary" seems to be used in so many ways that, out of context,
it's practically meaningless. One way in the classical field - and
they can't agree whether it means post-tonal or post-1970. Then
there's "Adult Contemporary" describing a type of radio playlist.
There's "Christian Contemporary" for the sort of watered-down rock
that infects some churches.

I don't see any references to it meaning "current popular music",
which is what someone outside the field might expect it to mean.

At least the world (except Arny) agrees pretty well on the definition
of Sub-bass, Bass, Midrange etc. :-)