At almost 44 years old, only today did it occur to me to look up the singular form of "parentheses". It's "parenthesis". I will no longer stumble in conversation on the roughly semi-annual occasion I have to use that word.
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Somehow, though I knew those, I didn’t apply the pattern to parentheses
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My hypothesis is that it’s to do with the different emphases between parentheSES and THEsis.
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That is very generous of you

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(I had to look up “emphases” just now to make sure it was a real word)
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every real word started as a made-up word
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That's a cromulent point.
End of conversation
New conversation -
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Exegesis!
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