Dead-letter meaning

An unclaimed or undelivered letter that after a period of time is destroyed or returned to the sender by the postal service.
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A law, rule, or precedent still formally in effect but no longer valid or enforced.
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A law, practice, etc. no longer enforced or operative but not formally done away with.
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A letter that cannot be delivered or returned, as because of incorrect address and lack of return address.
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An item of mail that cannot be delivered to its intended recipient; after some time it is returned to the sender, or destroyed.
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(by extension) A law that is no longer enforced.
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