1. A boundary or dividing line that is not precisely defined or measured, but rather estimated or roughly determined
The approximate boundary between the two properties was marked by a row of trees.
O limite aproximado entre as duas propriedades foi marcado por uma fileira de árvores.
2. In technical or scientific contexts, a boundary that is established with a certain margin of error or tolerance
The approximate boundary of the search area was set at 50 kilometers from the epicenter.
O limite aproximado da área de busca foi estabelecido em 50 quilômetros do epicentro.