This is the 514th most frequent Portuguese word.
internacionais
"Internacionais" means "international" in English.
In this sentence, 'internacionais' modifies the noun 'acordos' (agreements) to specify that they are of an international nature, thereby functioning as an adjective.
Os acordos internacionais promovem a cooperação entre os países.
International agreements promote cooperation among countries.
'Internacionais' in this context qualifies the noun 'eventos' (events), emphasizing that the scope of these events extends across national borders.
Eventos internacionais costumam atrair participantes de diversas culturas.
International events often attract participants from various cultures.
Here, 'internacionais' describes the noun 'assuntos' (subjects), indicating that these subjects are related to matters concerning multiple nations.