The plural form of the word 'phenomenon' is 'phenomena'. However, keep in mind that 'phenomena' is one of those tricky words that slides smoothly off the tongue in conversation, yet can trip us up in writing. Sometimes it's confusing to remember which words follow which rules.
You see, 'phenomenon' is borrowed from Greek and it retains its Greek roots when pluralized. It's not English's standard pluralization - adding an 's' or 'es', like 'cats' or 'buses', this word leans on its Greek heritage. That's why we say 'one phenomenon, two phenomena'.
It's similar to words like 'criterion' and 'symposium' which become 'criteria' and 'symposia', respectively. So, when you're discussing about more than one remarkable or extraordinary fact or event, you're referring to 'phenomena'. It's pretty phenomenal, isn't it? It just goes to show the English language is a mixed bag, borrowing words and rules from different languages. With everyday practice and attention to these special cases, it can become second nature. So, remember, when you see an extraordinary event, it's a phenomenon. But if you see a series of them, they're phenomena!
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