Does concerning means apropos?

The word "apropos" means appropriate, as in "The man's black suit was apropos for the funeral."

This amendment states that no person shall be tried without a grand jury (unless there is a special case.), no person is to be tried and punished for the same crime more than once, and if a person's...

Sustain is the amount of time a drum rings or vibrates so that you can hear it. For example, a timpani drum has long sustain but a snare drum has a short one.

Physical plant in terms of theater means the actual building the theater is housed in, or in other words, the architectural home that the theater space is a part of.

The word "mintage" applies to all coins regardless of their metal composition. It simply means the number of coins minted for a particular year, type, variety, etc.