'vous' is used as the formal you. It is also used as the plural of 'tu' which is the singular, informal 'you'.
Au revoir is formal, adieu is less formal.
formel(le)
banquet
Yes, it is the french meaning of a formal "hello"; literally translating to good day. "Bon"=good, "jour"=day. A similar word is "salut", which is less formal than bonjour.
In French, this is 'un banquet'.
banquet
banquet
banquet
un banquet
The word '"Soiree"' comes from the French language. It translates to "evening", or to "a formal evening party" in other cases. It is rarely used in the English language, though.
"You" or "You all" are English equivalents of the French word vous.Specifically, the French word is a personal pronoun. It may be translated as the second person formal singular "you" or the second person formal and informal plural "you all." Whatever the meaning or use, the pronunciation remains the same: "voo."
No, bikini is not a French word. Although it was used in French.