Definition for dead letter - Oxford Dictionaries Online (World English)

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	dead letter (dead let¦ter) noun 1a law or treaty which has not been repealed but is ineffectual or defunct in practice. a thing which is unimportant or obsolete: theoretical reasoning is a dead letter to a child 2chiefly North American an unclaimed or undelivered piece of mail.		Search results in the dictionary dead letter box More results » Nearby Words dead bat dead cat bounce dead centre dead duck dead end dead hand dead heat dead language dead leg dead letter dead letter box dead lift dead load dead loss dead man dead man's fingers dead man's handle dead march dead reckoning