This is the 14197th most frequent German word.
größter
"Größter" means "largest" or "greatest" in English.
In this sentence, 'größter' refers to physical height, used as the superlative form of the adjective 'groß' meaning 'tall' or 'large'.
Er ist der größte Mann im Raum.
He is the tallest man in the room.
Here, 'größter' indicates the magnitude or importance of 'wish,' using 'größter' as the superlative form of 'groß' in a figurative sense.
Das ist mein größter Wunsch.
That is my biggest wish.
In this context, 'größter' describes the largest portion by quantity or size, providing a comparative context.