Parenthesis (rhetoric)

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In rhetoric, a parenthesis (plural: parentheses; from the Greek word παρένθεσις, which comes in turn from words meaning "alongside of" and "to place") is

An explanatory or qualifying word, clause, or sentence inserted into a passage with which it doesn't necessarily have any grammatical connection, and from which it is usually marked off by round or square brackets, dashes, or commas

according to the Oxford English Dictionary.

[edit] Examples

Karl, a great singer, was not a good dancer.

The phrase a great singer, set off by commas, is both an appositive and a parenthesis.

A dog (not a cat) is an animal that barks.

The phrase not a cat is a parenthesis.

Please, Duncan, come here!

Duncan is both a noun of direct address and a parenthesis.

[edit] Punctuation

While a parenthesis need not be written enclosed by the curved brackets called parentheses, their use principally around rhetorical parentheses has made the punctuation marks the only common use for the term in most contexts.