nonstandard means not used in standard language (standard language:formal,dialect language:informal)
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khoffYou're correct -- but I think the entry you quoted is saying that "phenomena" is sometimes used as a nonstandared form of the singular, in which case its plural (also nonstandard) is "phenomonas."
Grammar GeekIt took me quite a while to understand it,Me, too. It would have been more helpful had it said