This is the 1410th most frequent Portuguese word.
válido
Valid; acceptable or legally binding.
Here, 'válido' describes that the promotional code is legitimate and can be used.
O código promocional ainda está válido.
The promotional code is still valid.
In this sentence, 'válida' conveys that the opinion is reasonable and credible.
Essa opinião é válida e deve ser considerada.
This opinion is valid and should be considered.
Here, 'válida' indicates that the authorization is legally effective within the specified timeframe.