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Parentheses is the regular plural.

Usually, you use a pair of the signs showing an insertion, then "between parentheses" - or brackets ; however, "in parenthesis" means : as an afterthought.

Parenthesis | Definition of Parenthesis by Merriam-Webster

‘The Cambridge Guide to English Usage’ describes parenthesis as ‘a string of words interpolated into a sentence but syntactically independent of it’.

5/24/2017 · parentheses

It describes parentheses as:

Parentheses is usually used to refer the pair of brackets often used to set off a parenthetical – but the term could also be used for more than one parenthetical.

. . . the standard name for round brackets in the US and Canada, and increasingly in Australia. In the UK parentheses is still mostly a technical term, by BNC evidence, where it appears in scientific and bureaucratic documents. But overall British writers are about three times more likely to use in brackets than in parentheses.

What is the plural of parenthesis? - WordHippo

Parenthesis is of course Greek and means in fact

When it is both singular and plural due to the parenthesized optional part, should I use the an because of thinking of what follows as being the singular (that is, study topic)?

A term ending in “(s)” is both plural and singular. If you must use such a device (and it can be a useful shorthand), you have to be prepared to adjust the surrounding context as necessary: for example, “the award(s) is (are) accounted for.” A parenthetical plural verb must correspond to the parenthetical ending. But that’s an awkward example. In general, avoid such shorthand unless it can be used simply and effectively, as in the following example:

2. Morphology. The following grammatical outline is based on the Coastal dialect, with Raḵšāni forms given in parentheses.
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“parentheses” vs “parenthesis” ..

In most cases, I think either the singular or the plural will work fine. Why clutter it up with both or with (s)? Using the plural form "Selecting appropriate topics" doesn't preclude the possibility of finding only one appropriate topic--or even none.

Parentheses is the regular plural

The material included in the parenthesis, being supplemental, is considered not to be an actual component to the sentence, thereby being excluded from the rules regulating the rest of the sentence. I would then have to logically conclude that the inclusion of merely a potential plurality does not merit the supercession of the established noun quantity.

singular form of parentheses/ parenthesis | …

I agree that it is an awkward way of dealing with the problem. It would have been preferable to have had something like Selecting an appropriate study topic or topics. As it is, it’s a matter of choosing between two evils, but the second seems preferable. An followed by a possible plural in the first looks odd, but dropping the article allows the reader two interpretations. One is Selecting appropriate study topics. The other is Selecting appropriate study topic, which can be read as an abbreviated form.

The Plural of Parenthesis - Grammar Monster

I find "one or more object(s)" to be much harder to read, as I have to parse the phrase with both possibilities. The parentheses are a distraction. As , the Chicago Manual of Style recommends against using it unless it is simple and effective. I would argue that it isn't simple enough, and using the plural is more effective.

What is the singular of parentheses - WordHippo

Note that sentence-ending periods should go outside the parentheses if the parenthetical remark is part of a larger sentence, but inside the parentheses if it's not embedded in a larger sentence. This is an example of the first (notice the punctuation goes outside, because we're still part of that outer sentence). (This is an example of the second, because we're no longer inside any other sentence; the parenthesis is its own sentence.)

What is the singular of parentheses

A few exceptions require special care. In some noun phrases, the “head noun” gets the plural, even if it's not at the end of the noun phrase: mothers in law, attorneys general, courts martial. (Such forms may be disappearing, but they're still preferred.)

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