They spoke to me with great humanity, and said, "they were sure the captain would carry me gratis to Lisbon, whence I might return to my own country; that two of the seamen would go back to the ship, inform the captain of what they had seen, and receive his orders; in the mean time, unless I would give my solemn oath not to fly, they would secure me by force.
There are no more uses of "gratis" in the book.
Show samples from other sources
"Deo gratis," the choir sang back and the people stood to leave.
Rudolfo Anaya -- Bless Me, Ultima
That, if the ship was recovered, they should afford Friday and myself a passage gratis to England.