 "Jazz" (We change the spelling each time so as not to offend either faction) can be defined, but it cannot be synonymized.If there were another word that exactly expressed the meaning of "jaz," "jazz" would never have been born.A new word, like a new muscle, only comes into being when it has long been needed...This remarkable and satisfactory-sounding word, however, means something like life, vigor, energy, effervescence of spirit, joy, pep, magnetism, verve, virility ebulliency, courage, happiness – oh, what's the use?