Search the dictionary A Chinese word or character, or English Draw a character Search 4 entries. quèdìngxìng 确定性 determinacy quèdìngxìng 確定性 determinacy bùquèdìngxìngyuánlǐ 不确定性原理 Heisenberg's uncertainty principle (1927) bùquèdìngxìngyuánlǐ 不確定性原理 Heisenberg's uncertainty principle (1927)