1. A practice or way of behaving that has been accepted and followed by a group, community, or society for a long time
It is an established custom to exchange gifts during Christmas.
É um costume estabelecido trocar presentes durante o Natal.
2. A traditional practice that has become standardized and widely recognized
Wearing a wedding ring is an established custom in many Western cultures.
Usar uma aliança de casamento é um costume estabelecido em muitas culturas ocidentais.