Plural of floridity; instances or examples of florid, ornate, or flowery style or expression.
From floridity (the quality of being florid) with the plural suffix -ies. The noun floridity itself comes from Latin florīdus meaning flowery or ornate, with the English suffix -ity forming abstract nouns.
When someone says a piece of writing is full of 'floridities,' they're basically calling it overly fancy or ornamental! It's a criticism that means the flowery language is getting in the way of the actual message.
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