1. A communication intended to be known only by the sender and recipient(s), hidden from others
He sent her a secret message using invisible ink.
Ele enviou a ela uma mensagem secreta usando tinta invisível.
2. A hidden or encoded communication requiring decryption or special knowledge to understand
The spy decoded the secret message from headquarters.
O espião decodificou a mensagem secreta da sede.
3. An implicit or underlying meaning conveyed indirectly
There was a secret message in the poem about loss and hope.
Havia uma mensagem secreta no poema sobre perda e esperança.