[ob-suh-leet, ob-suh-leet]
no longer in general use; fallen into disuse: an obsolete expression.
of a discarded or outmoded type; out of date: an obsolete battleship.
(of a linguistic form) no longer in use, especially, out of use for at least the past century. Compare archaic.
effaced by wearing down or away.
Biology. imperfectly developed or rudimentary in comparison with the corresponding character in other individuals, as of the opposite sex or of a related species.
verb (used with object), obsoleted, obsoleting.
to make obsolete by replacing with something newer or better; antiquate: Automation has obsoleted many factory workers.

1570–80; < Latin obsolētus, past participle of obsolēscere to fall into disuse, perhaps equivalent to ob- ob- + sol(ēre) to be accustomed to + -ēscere -esce

obsoletely, adverb
obsoleteness, noun
nonobsolete, adjective
subobsolete, adjective
subobsoletely, adverb
subobsoleteness, noun
unobsolete, adjective

1. archaic, obsolescent, obsolete ; 2. obsolescent, obsolete.

2. antiquated, ancient, old.

1, 2. new, modern.

Terms and definitions labeled Obsolete in this dictionary have not been in widespread use since the mid 1700s. Unlike some relatively familiar archaic words and phrases, like prithee and thou art, obsolete words and phrases are not easily understood by a modern reader, and obsolete senses of current terms, as found in definitions 13, 14, and 15 of nice, are even more difficult for a contemporary reader to recognize.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
obsolete (ˈɒbsəˌliːt, ˌɒbsəˈliːt)
1.  out of use or practice; not current
2.  out of date; unfashionable or outmoded
3.  biology (of parts, organs, etc) vestigial; rudimentary
[C16: from Latin obsolētus worn out, past participle of obsolēre (unattested), from ob- opposite to + solēre to be used]
usage  The word obsoleteness is hardly ever used, obsolescence standing as the noun form for both obsolete and obsolescent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1570s, from L. obsoletus "grown old, worn out," pp. of obsolescere "fall into disuse," probably from ob "away" + solere "to be used to, be accustomed."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Many of the other chemical agents currently used may also become obsolete.
The top-down educational hierarchy is increasingly obsolete, and good riddance.
Either way, the fact is that the technology is making the old economy obsolete.
Because of the accelerated pace, the impression spreads that anything more than
  a few years old is obsolete.
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