principle of equivalence principled • principle of liquid displacement · · · Info · Definitions · Characters · · principle of equivalence · · Text Common · · Latin · · Scripts 24 · · Length 9 · · Syllables Definitions · · · (noun) (physics) the principle that an observer has no way of distinguishing whether his laboratory is in a uniform gravitational field or is in an accelerated frame of reference. Synonyms: principle of equivalence. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 q latin small letter q U+0071 r latin small letter r U+0072 u latin small letter u U+0075 v latin small letter v U+0076