› (especially in mathematics) a formal statement that can be shown to be true by logic: a mathematical theorem

in Spanish | teorema… |

in French | théorème… |

in German | das Theorem… |

in Chinese (Traditional) | （尤指數學中的）定理… |

in Chinese (Simplified) | （尤指数学中的）定理… |

(Definition of theorem from the Cambridge Advanced Learners Dictionary & Thesaurus
© Cambridge University Press)

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April 01, 2015

When you are using a language, it is important to understand if a word is formal or informal, so that you can use it in an appropriate way. You might hear people saying dosh for money, or spud for potato, but they wouldn’t write those words in a formal essay. Similarly, a