ob·so·lete

[ob-suh-leet, ob-suh-leet] adjective, verb, ob·so·let·ed, ob·so·let·ing.
adjective
1.
no longer in general use; fallen into disuse: an obsolete expression.
2.
of a discarded or outmoded type; out of date: an obsolete battleship.
3.
(of a linguistic form) no longer in use, especially, out of use for at least the past century. Compare archaic.
4.
effaced by wearing down or away.
5.
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)
6.
to make obsolete by replacing with something newer or better; antiquate: Automation has obsoleted many factory workers.
00:10
Obsolete is always a great word to know.
So is nucleus. Does it mean:
a mass of protoplasm found in most cells, directing their growth, metabolism, reproduction, and functioning in the transmission of genic characters
natural selection that favors altruistic behavior toward close relatives resulting in an increase in the individual's genetic contribution to the gene pool

Origin:
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

ob·so·lete·ly, adverb
ob·so·lete·ness, noun
non·ob·so·lete, adjective
sub·ob·so·lete, adjective
sub·ob·so·lete·ly, adverb
sub·ob·so·lete·ness, noun
un·ob·so·lete, adjective

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


2. antiquated, ancient, old.


1, 2. new, modern.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
obsolete (ˈɒbsəˌliːt, ˌɒbsəˈliːt) [Click for IPA pronunciation guide]
 
adj
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  out of date; unfashionable or outmoded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
 
'obsoletely
 
adv
 
'obsoleteness
 
n

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

obsolete
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
They are a parody of the minimalist doctrine that all painting had become
  obsolete.
Old strategies become obsolete and new ones are called for.
There may be a lot of interesting obsolete instructions hidden in our genes.
Because of the accelerated pace, the impression spreads that anything more than
  a few years old is obsolete.
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