This is the 357th most frequent Italian word.
breve
Short.
In this sentence, 'breve' is used as an adjective to describe the noun 'risposta,' referring to its short duration or concise nature.
La risposta fu breve ma esauriente.
The answer was brief but comprehensive.
Here, 'breve' once again functions as an adjective, indicating the desire for a short duration of the meeting.
Spero che questa riunione sia breve.
I hope this meeting will be short.
In this case, 'In breve' acts as an adverbial phrase that summarizes the situation succinctly.