› especially in mathematics, something that has been or must be proved to be true by careful reasoning

teorema

a geometrical theorem.(Definition of theorem from the Password English-Spanish Dictionary
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October 22, 2014

We often make adjectives stronger by putting an adverb in front of them. The most common ones are very and, for a stronger meaning, extremely: He was very pleased. The ship is extremely large. However, we don’t use very or extremely for adjectives that already have a strong meaning, for example fantastic,