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  1. Key Member
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      • Native Language:
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    Question Plural form of abbreviations

    Consider some abbreviation, say, ANOVA (analysis of variance). If I am talking about several analyses of variance, should I use "several ANOVA's" or just "several ANOVAs"? The same with mathematical symbols. Consider several variables denoted Xi. Should I use "X's", or just "Xs"? I have met both these forms in the literature and I am wondering whether they both are correct.

    Thanks in advance!

  2. Editor,
    English Teacher
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      • British English
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      • UK
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      • Laos

    • Join Date: Nov 2002
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    Re: Plural form of abbreviations

    I wouldn't use an apostrophe in either case because the lower case makes it clear. I'd only use an apostrophe with a lower case- x's. However, many use an apostrophe with acronyms, numbers and letters.

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