1. An unmodified or naturally occurring surface, such as earth, rock, water, or vegetation, not artificially created or processed
The hikers preferred walking on natural surface rather than concrete paths.
Os caminhantes preferiam caminhar em superfície natural em vez de caminhos de concreto.
2. In construction and engineering, any surface that exists in nature without human intervention
The building was constructed on a natural surface of granite bedrock.
O edifício foi construído em uma superfície natural de leito rochoso de granito.
3. In sports, a playing surface made of earth, grass, clay, or other organic materials rather than synthetic materials
The tennis tournament was held on a natural surface clay court.
O torneio de tênis foi realizado em uma quadra de barro de superfície natural.