The meaning of CANNOT is can not. How to use cannot in a sentence. Usage of Cannot and Can't: Usage Guide. Can’t is a contraction of cannot, and it’s best suited for informal writing. In formal writing and where contractions are frowned upon, use cannot. It is possible to write can not, but you generally find it only … However, in most circumstances, you should use "cannot" (i.e., the one-word version). "Cannot" (one word) is the most common expansion of the contraction "can't." For example: I cannot do it! ("Can't" is … Sep 19, 2019 · For example, “I cannot lift this heavy box” and “I can’t lift this heavy box” have the same meaning. However, “cannot” is more formal and is generally used in written English, while “can’t” is … CANNOT definition: 1. the negative form of the verb "can": 2. used to say that something will certainly happen: 3…. CANNOT definition: a form of can not. See examples of cannot used in a sentence. Definition of cannot in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.