from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An unclaimed or undelivered letter that after a period of time is destroyed or returned to the sender by the postal service.
- noun A law, rule, or precedent still formally in effect but no longer valid or enforced.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An item of
deliveredto its intended recipient; after some time it is returnedto the sender, or destroyed
- noun by extension A
lawthat is no longer enforced
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun mail that can neither be delivered nor returned
- noun the state of something that has outlived its relevance
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