noun
a formal request from a court in one country to a court in another country for judicial assistance in the form of obtaining evidence or serving documents
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The judge approved the letter rogatory to be sent to the foreign court for assistance in the case.
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The lawyers are working on getting a letter rogatory to help with the legal proceedings abroad.
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We're gonna need to send a letter rogatory to get the necessary information from the overseas authorities.
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Sending a letter rogatory is like asking for a helping hand from another country's legal system.