Università vs. ateneo
In Italian, both università and ateneo translate to university. However, they are not perfectly interchangeable, as they differ in formality, nuance, and common usage.
Università
A2This is the standard, common, and universally understood word for university. It is used in all everyday conversations and most written contexts to refer to the institution of higher education in general.
Mio fratello studia medicina all'università di Bologna.
(My brother studies medicine at the University of Bologna.)
Quando finirai l'università?
(When will you finish university?)
Le tasse per l'università sono piuttosto alte quest'anno.
(The university fees are quite high this year.)
Sto andando in biblioteca all'università per studiare.
(I'm going to the library at the university to study.)
Ateneo
B2This is a more formal, literary, and often bureaucratic term for university. It emphasizes the institution as a whole community of scholars, professors, and students, or refers to its central administration and buildings. It is commonly found in official documents, news reports, and academic contexts.
Il rettore del nostro ateneo ha inaugurato l'anno accademico.
(The rector of our university inaugurated the academic year.)
Il prestigioso ateneo fiorentino ha ospitato una conferenza internazionale.
(The prestigious Florentine university hosted an international conference.)
Troverà tutte le informazioni sul sito ufficiale dell'ateneo.
(You will find all the information on the university's official website.)
Il nostro ateneo promuove la collaborazione con aziende estere.
(Our university promotes collaboration with foreign companies.)
L'offerta formativa di questo ateneo è molto vasta.
(The educational offering of this university is very broad.)
Summary
In essence, use università for all general and everyday purposes. It is the default word. Use ateneo in more formal, official, or high-level contexts, such as in official university communications, news articles, or when wanting to sound more formal or sophisticated. While ateneo can often replace università in formal writing to add variety, you would almost never use ateneo in casual spoken language.