This is the 1677th most frequent Portuguese word.
assinada
Signed.
Here, 'assinada' is the past participle of the verb 'assinar', meaning 'to sign'. It's used in the passive voice indicating the action performed by the actor (the director).
A carta foi assinada pelo diretor.
The letter was signed by the director.
'Assinada' is the feminine form as it agrees with 'contrato', and the sentence shows a requirement to complete the signing action.
O contrato precisa ser assinada até amanhã.
The contract needs to be signed by tomorrow.
In this context, 'assinada' describes the state or condition of the declaration, emphasizing its completion.