The singular form of phenomena is "phenomenon." The word originates from Greek and follows a specific pluralization pattern. Contrary to most words in English, where 's' or 'es' is appended to create the plural form, certain Greek and Latin words like phenomenon change in their root form: phenomenon (singular), phenomena (plural). Similar examples include criterion (singular), criteria (plural); bacterium (singular), bacteria (plural). It's a fascinating quirk of the English language's diverse origins, isn't it?
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