Based on what the root word phon means, the word phonometry means "The measurement of sound"
Explanation:
Phon is a Greek root word that means "sound" it can be used as a prefix and as a suffix as well, in this case, we have it as a prefix followed by metry which comes from meter that is related to the measurement of anything, then both together give us the definition that Phonometry is the measurement of sound with a phonometer.
I think that Jetforson concluded with this statement because he wants to make sure that nobody breaks their promise to support and live by the declaration. I hope this helps you!
