In a manner that occurs every ten years or relating to something that happens at ten-year intervals.
Formed by adding the adverbial suffix -ly to the adjective decennial. This follows standard English grammar patterns for converting adjectives into adverbs that describe how often or in what manner something happens.
The decennial census happens decennially in many countries—it's one of those rare government projects where you can actually mark on a calendar 'in exactly 10 years, this will happen again.' It makes population tracking consistent and comparable across generations!
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