What is the correct way?
CM stand for cervical mucus (without s in the end of stand)
CM standS for cervical mucus (with s in the end of stand)
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When we cite acronyms, or words or even phrases, we treat the whole citation as singular. A citation is when we mention the acronyms or words but we aren't actually using them in a normal way in the sentence. We could, for example, put the word(s) or acronym in 'quotes', or in italics:
In the examples above we see the third person singular verb forms is, means, stands instead of the plural forms are, mean and stand.
Hope this is helpful!