01 n. A word, phrase, or sentence, by way of comment or explanation, inserted in, or attached to, a sentence which would be grammatically complet…
pl.
Parentheses ((#))
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1.
A word, phrase, or sentence, by way of comment or explanation, inserted in, or attached to, a sentence which would be grammatically complete without it. It is usually inclosed within curved lines (see def. 2 below), or dashes.“Don't suffer every occasional thought to carry you away into a long parenthesis.” — Watts.
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2.
One of the curved lines () which inclose a parenthetic word or phrase.(Print.)