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I often find myself using the two words joined together, moreso. I'm not sure where I picked up this usage. I'm also not sure that it's necessarily the correct one, as some proofreading tools will flag for not being a correctly-spelled word. Though I have seen it in multiple places when I've been looking for it, even on this site.

Is moreso generally accepted as being correct? Would it be correct to use in a serious paper?

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    I have never seen it before in my life, and nor is it recognised by Oxford Dictionaries on-line.
    – WS2
    Dec 2, 2014 at 9:27
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    The one-word form "moreso" is covered fairly well in this Grammarist article: grammarist.com/usage/moreso
    – Dan Bron
    Dec 2, 2014 at 9:29
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    @DanBron I have just noticed that the OED recognises moreso as a US usage, meaning simply 'more so' as in 'all the more so'.
    – WS2
    Dec 2, 2014 at 9:33
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    I would use it at any level of formality, unless I had a particular reason to avoid risking the disapproval of conseratives. Moreso because its usage and acceptance are in flux. Fight the power! Dec 2, 2014 at 11:24
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    I'm from the States and frequently read scientific literature from around the world. I have never seen moreso anywhere, and I hate it. It reads like a word that rhymes with peso. Nov 10, 2016 at 4:43

3 Answers 3

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Moreso and more so are both correct, but in different contexts.

Example:

Anna's performance was good, but Emma's more so.

In this example, the "so" in more so relates back to the statement of the quality of Anna's performance.

However,

I believed the novel was moreso about oppression than the human spirit.

In this case, there is no precedent to justify "more so", therefore "moreso" is used instead.

Be aware also that "moreso" is considered less formal than "more so".

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    It's true that the phrase more so, as conventionally used, does not work in your second example; but this does not imply that it should be spelled differently (or that spelling it differently will improve anything). Note, for example, that a lot is still written as two words in a phrase like a lot bigger (though some people have indeed tried to write it as alot).
    – ruakh
    May 16, 2016 at 2:35
  • @ruakh There are examples the other way, as well. "I don't want any more to eat." vs "I don't eat anymore." Also consider adverbial "every day" vs. adjectival "everyday."
    – rintaun
    Sep 24, 2016 at 9:42
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    @rintaun: Those are not "examples the other way", since "anymore" and "everyday" are both cases where a compound was standardly written open ("I don't eat any more") or at least hyphenated ("an every-day affair") and eventually became closed. Grammarian's answer is asserting that the whole reason some people write "moreso" is that there's no history of using "more so" that way.
    – ruakh
    Sep 24, 2016 at 17:31
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    Does your second example mean something different with that word "moreso" than it would with the actual word "more"?
    – bof
    Jan 26, 2019 at 7:47
  • Please add a valid reference to substantiate your claims. Jul 28, 2021 at 11:15
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That Grammarist post is completely misleading, not to mention contradictory.

IF "More so strictly means that to a greater degree ...," then the word "more" is a crucial element of the sentence:

Gina is studious, and Eleanor is more so.

The sentence is stating that "Gina is studious," and that "Eleanor is more so." Meaning, while Gina is studious, Eleanor is MORE studious than Gina. Therefore the word MORE, is crucial.

You cannot simply replace the word "more" with "less" or "equally" because those two words are in no way equivalent to "more." If you stated that ... Gina is studious, and Eleanor is less so. ... you would be stating that Eleanor is LESS studious than Gina, and therefore it is not an equivalent sentence.

The logic behind the Grammarist site post on this topic is baffling, to say the least.

Anyways, in my opinion, while "moreso" is used MORE (not LESS or EQUAL TO) in the US than in other places, it would probably be wise to use the two-word version (more so) than the one-word, just because it is more widely acknowledged. Acceptance is a bit irrelevant considering the differences among many languages around the world.

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    I am just going to assume that it was done with a devilish sense of irony and humor, but seeing a post about correct English word usage and grammar where the concluding paragraph begins with the word "Anyways" was quite jarring! I couldn't stop staring at it and forgot to read the rest of the post.
    – Fonebone
    Jul 4, 2021 at 4:11
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Excerpting this Grammarist post:

Though more so spelled as two words, the one-word moreso gained ground despite the disapproval of usage authorities.

More so strictly means that to a greater degree, and so refers to an adjective or adverb used earlier.

E.g.:

Gina is studious, and Eleanor is more so

In the sentence above, so refers to the the adjective studious, and is a crucial element of the sentence while more is not. Because more and so function separately, changing more so to moreso in cases like this is difficult to justify.

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    In my opinion, this answer owes too much to the Grammarist post cited elsewhere in this question without giving proper credit.
    – tylerharms
    May 14, 2015 at 10:39
  • @Mustapha "Moreso" is also a proper noun... google.fr/…
    – Elian
    Feb 20, 2016 at 20:42

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