Meaning of DEAD LETTER

Pronunciation:			ded 'letur
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WordNet Dictionary
	Definition:		[n]  a letter that can neither be delivered nor returned [n]  the state of something that has outlived its relevance
	Synonyms:		non-issue
	See Also:		letter, missive, state
Thesaurus Terms
	Related Terms:		aerogram, aimlessness, air letter, airgraph, billet-doux, bull, chain letter, dimissorial, dimissory letter, drop letter, emptiness, empty sound, encyclical, fan letter, form letter, futility, inanity, insignificance, letter of credit, letter of introduction, letters credential, letters of marque, letters of request, letters overt, letters patent, letters rogatory, love letter, meaninglessness, mere noise, monitory, newsletter, nixie, noise, nonsensicality, nullity, open letter, Pastoral Epistle, pastoral letter, phatic communion, poison-pen letter, purposelessness, round robin, senselessness, unmeaningness, unsignificancy