uberrima fides n[Latin, most abundant good faith]
: utmost or perfect good faith [acted in uberrima fides ] NOTE: The terms uberrima fides and uberrimae fidei, although grammatically distinct in Latin, are often used interchangeably in English.
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.