"Le Plus" is French for "most".
qui est le plus âgé? who is the oldest?
It means "the happiest" in French.
"qui aime le plus l'école ?" means "who likes school best?" in French.
"the smallest country"
"C'est moi le plus fort" means 'I am the strongest' (or 'the best') in French.
The happiest of men
It means "Hello, most beautiful/handsome"
a night sweeter than the day
Vous êtes la plus magnifique tante. You are the most magnificent aunt.
I doesn't mean anything the beginning mean: nor the french language the end: please
the contraction is "du"
Is the south of France warmer than the north? -