hyphenation - Hyphens in verb construction containing prefix such as "re"

In semi-formal business writing in the United States, I often observe that writers tend to add a hyphen between a prefix and the root infinitive of verbs. In many of the cases, the resulting verb either does not appear in the dictionary at all, with or without the hyphen; or it does appear, but does not contain the hyphen.

It seems to me that the reason why we tend to insert the hyphen is because the verb, taken as a whole with its prefix, seems unnatural; so adding a hyphen is a syntactical decoration that has a similar effect to adding quotation marks around an unfamiliar word, or an invented word. The person must be thinking in their head, "Let's take this ordinary word that everyone understands, and tack on a prefix that everyone also understands... oh, wait, that sounds weird. Is that even a word? Hmm, probably not... well, I'll put a hyphen in here so that people can clearly separate the prefix from the verb and, by mentally putting the two together, understand the meaning."

Some examples:

"Re-opened" — All the dictionaries I could find (online, at least) give the infinitive "reopen", and some of them actually conjugate it as "reopened" in the examples.

"Re-tested" — I could find a few dictionaries that give the infinitive "retest", but none that specify "re-tested" as a conjugation. The only dictionary I could find with this infinitive was thefreedictionary.com; MW doesn't have it.

Another popular prefix is "un-", but that can often be substituted with an antonym; for example "undeployed" could become "removed" or "reverted deployment of...".

My questions/remarks about this tendency are as follows:

Obviously, if an authoritative dictionary of the English language lists the infinitive with the prefix but without a hyphen, it is an error to add a hyphen, either to the infinitive or to any conjugation. Correct?

If an authoritative dictionary does not list the infinitive with the desired prefix at all, and the writer wants to use the prefix with that infinitive anyway, is it more appropriate to include a hyphen or to omit it? This question is important because many business and technical scenarios require the application of unconventional prefixes to infinitives. The meaning of these words is often understood very intuitively by insular "in-groups" of readers who are colleagues and use these terms as jargon in a particular field of discourse.

Other than quoting the dictionary, are there any more abstract rules of the English language that I could cite to justify including (or not including) a hyphen in these cases? I am especially interested in rules that would explain, to those who think the hyphen belongs there, why it does not. If there is a general case rule that would apply to most or all cases of tacking on prefixes to existing infinitives, that would be ideal.

While I prefer avoiding these problems whenever possible, by using appropriate antonyms for "un-" and appropriate repetition words for "re-", sometimes it is necessary to apply a prefix and create a jargon term, or write down a jargon term that is completely entrenched in the verbal usage of a large population.

Answer

Usually you can just slap re on the front of a word, without a hyphen, and you will be understood. There’s no need for the term to have made its way into an “authoritative” dictionary, even if there were such a thing.

There are circumstances in which the hyphen is desirable:

if your new word with re collides with an established “re” word which has a different sense. Two of the words Carlo_R mentions are of this sort: resign and reserve.

If you want to draw attention to the fact that you are using a “re” word in a different sense than that which would be expected, particularly if you are reverting to the base sense. “D.W.Griffith’s re-construction of the myth of the carpetbagger.”

If you want to emphasize that you are repeating or reversing an action. “Burns opened an interesting question in 1923; but it has been completely neglected and I want to re-open it now.”

I sometimes intrude a hyphen when the word to which I’m attaching re begins with a vowel, to prevent even momentary confusion; but it’s probably not necessary.

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