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[ob-suh-leet, ob-suh-leet] /ˌɒb səˈlit, ˈɒb səˌlit/
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of a discarded or outmoded type; out of date: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
Related forms
obsoletely, adverb
obsoleteness, noun
nonobsolete, adjective
subobsolete, adjective
subobsoletely, adverb
subobsoleteness, noun
unobsolete, adjective
Can be confused
archaic, obsolescent, obsolete.
obsolescent, obsolete.
2. antiquated, ancient, old.
1, 2. new, modern.
Usage note
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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for unobsolete


/ˈɒbsəˌliːt; ˌɒbsəˈliːt/
out of use or practice; not current
out of date; unfashionable or outmoded
(biology) (of parts, organs, etc) vestigial; rudimentary
Derived Forms
obsoletely, adverb
obsoleteness, noun
Usage note
The word obsoleteness is hardly ever used, obsolescence standing as the noun form for both obsolete and obsolescent
Word Origin
C16: from Latin obsolētus worn out, past participle of obsolēre (unattested), from ob- opposite to + solēre to be used
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unobsolete
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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