English translation: Hi everybody ; Hello (to) everybody
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Explanation: This expression really means "Salutations to everyone" or "I salute you all". With time, it has become something more familiar and is now considered merely a (brief) greeting formula. ( It is used extensively in Québec, by the way, as a very friendly greeting. "Hé! Salut tout le monde!")
I would translate it with "Greetings everyone" or "My salutations to all", even though this sounds a little high class, because it has the right "feel" to it...