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| dead let·ter (plural dead let·ters) |
noun |
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| Definition: |
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1. letter that cannot be delivered: a letter that the postal service cannot deliver, usually because the address is inadequate or the addressee does not claim it
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2. unenforced or ineffective rule: a law or regulation that still applies but is not enforced or uniformly obeyed
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3. something now irrelevant or unimportant: something that is no longer considered relevant or important
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