This is the 407th most frequent Portuguese word.
compromisso
A commitment, obligation, or appointment.
In this sentence, 'compromisso' is used to denote a scheduled appointment or arrangement that the speaker has.
Tenho um compromisso às três da tarde.
I have an appointment at three in the afternoon.
'Compromisso' here indicates a sense of commitment or dedication to a particular task or role.
Ele tem um compromisso com sua carreira.
He is committed to his career.
In this context, 'compromisso' signifies a formal or informal promise or obligation made by the subject.