1. A private issue or concern that belongs to an individual and is not meant for public discussion or workplace involvement
I can't discuss that; it's a personal matter.
Não posso discutir isso; é um assunto pessoal.
2. Something related to one's private life, family affairs, or intimate concerns
She declined to attend the meeting due to a personal matter.
Ela recusou participar da reunião devido a um assunto pessoal.