uncertainty principle uncared-for • uncertainty relation · · · Info · Definitions · Synonyms · Antonyms · Characters · · uncertainty principle · · Text Common · · Latin · · Scripts 21 · · Length Definitions · · · (noun) (quantum theory) the theory that it is impossible to measure both energy and time (or position and momentum) completely accurately at the same time. Synonyms: indeterminacy principle. · · Noun Definition 1 Synonyms · · · uncertainty · · Synonym 1 uncertainness · · Synonym 2 precariousness · · Synonym 3 doubt · · Synonym 4 incertitude · · Synonym 5 dubiety · · Synonym 6 doubtfulness · · Synonym 7 dubiousness · · Synonym 8 Antonyms · · · certainty · · Antonym 0 sure thing · · Antonym 1 foregone conclusion · · Antonym 2 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 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075 y latin small letter y U+0079