you all; gentlemen; wise individuals
Formal, somewhat old-fashioned address to a group of respected people, often in speeches or writing. Can be used sarcastically. The literal meaning is 'various wise people'.
I would like to hear the opinions of you all.
諸賢におかれましては、ますますご清栄のこととお慶び申し上げます。
I hope this letter finds you all in good health and prosperity.