noun
a papal letter sent to all bishops of the Roman Catholic Church
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The Pope issued an encyclical on climate change, urging all Catholics to take action.
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Have you read the latest encyclical from the Vatican? It's about environmental protection.
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I skimmed through that encyclical thing the Pope wrote, but it was too long for me to read fully.
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His speech was like an encyclical, covering every aspect of the topic in great detail.