It probably means 'of the moment'. Can you give us more context?
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AnonymousHello, I would like to know if here, in this sentence, the expression 'of the hour' does mean 'of the moment' or something like this: ' ... who called him " communication theory's man OF THE HOUR...' Thanks in advance, AnUsually when we say "man of the hour" it is the person we are honoring right now at this occasion for his or