This is the 5303rd most frequent Portuguese word.
quiserem
"Quiserem" is the third-person plural form of the subjunctive past tense of "querer," meaning "if they/you (plural) wanted."
Here, 'quiserem' is the third person plural form of the verb 'querer' in the present subjunctive, used to express a condition or possibility.
Se quiserem aprender mais sobre o tema, posso recomendar livros.
If you want to learn more about the topic, I can recommend books.
'Quiserem' in this case is used in a conditional framing to indicate options available to the group.
Os estudantes disseram que poderão participar da atividade se quiserem.
The students said they might join the activity if they desire.
In this context, 'quiserem' suggests an alternative in a mandatory scenario, showing the choice they hypothetically have but the obligation remains.