Possessio bona fide
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Possession in good faith. Possessio mala fide, possession in bad faith. A possessor bona fide is,one who believes that no other person has a better right to the possession than himself. A possessor mala fide is one who knows that he is not entitled to the possession.
Mackeld. Rom. Law, § 243.