1. A tree that is several centuries old; a tree of great age and historical significance
The ancient oak in the village square is a secular tree that has witnessed centuries of history.
O carvalho antigo na praça da aldeia é uma árvore secular que testemunhou séculos de história.
2. A large, venerable tree often of cultural, ecological, or monumental importance
This secular tree is protected by law due to its ecological and cultural value.
Esta árvore secular é protegida por lei devido ao seu valor ecológico e cultural.