Parentheses vs. Parenthesis

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Difference Between Parentheses and Parenthesis
Parenthesesnoun
plural of parenthesis
Parenthesisnoun
A clause, phrase or word which is inserted (usually for explanation or amplification) into a passage which is already grammatically complete, and usually marked off with brackets, commas or dashes.
Parenthesisnoun
Either of a pair of brackets, especially round brackets, ( and ) (used to enclose parenthetical material in a text).
Parenthesisnoun
(rhetoric) A digression; the use of such digressions.
Parenthesisnoun
Such brackets as used to clarify expressions by grouping those terms affected by a common operator, or to enclose the components of a vector or the elements of a matrix.
Parenthesisnoun
either of two punctuation marks (or) used to enclose textual material
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Parenthesisnoun
a message that departs from the main subject