This is the 8579th most frequent Portuguese word.
aceno
A gesture or signal, typically a wave or nod, to attract attention or communicate.
The word 'aceno' here is used to mean a physical gesture of acknowledgment or signal, typically done with the head as a 'nod'.
Ele deu um aceno discreto ao amigo para sinalizar que era hora de partir.
He gave a discreet nod to his friend to signal that it was time to leave.
In this sentence, 'aceno' refers to a gesture specifically through the movement of the hand as a 'wave'.
O aceno com a mão foi uma maneira amigável de cumprimentar os novos vizinhos.
The wave of the hand was a friendly way to greet the new neighbors.
Here, 'aceno' signifies a subtle nod of approval, often interpreted as a non-verbal agreement or praise.