This is the 5744th most frequent Portuguese word.
antónio
"António" is a Portuguese given name equivalent to "Anthony" in English.
In this sentence, 'António' is a proper noun, specifically a person's name.
António estuda na universidade.
António studies at the university.
Here, 'do António' indicates possession related to the person named António, forming a possessive structure.
O livro do António está em cima da mesa.
António's book is on the table.
In this case, 'o António' refers to the individual António, using the definite article 'o' signaling specificity.