What is parenthesis definition?

Parenthesis, also known as round brackets or simply brackets, are punctuation marks consisting of a pair of curved lines ( ). They are used to set off additional information or a comment within a sentence, without changing its grammatical structure or coherence. The content within the parenthesis can be a single word, a phrase, or a complete sentence. When used, the text inside the parenthesis is considered to be less important than the rest of the sentence. Parentheses are also used in mathematics to indicate multiplication or to group operations.