[ ob-suh-leet, ob-suh-leet ]
/ ˌɒb səˈlit, ˈɒb səˌlit /
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See synonyms for: obsolete / obsoleted / obsoletes / obsoleting on Thesaurus.com


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of a discarded or outmoded type; out of date: an obsolete battleship.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 a different sex or of a related species.

verb (used with object), ob·so·let·ed, ob·so·let·ing.

to make obsolete by replacing with something newer or better; antiquate: Automation has obsoleted many factory workers.



In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.

Origin of obsolete

First recorded in 1570–80; from Latin obsolētus, past participle of obsolēscere “to fall into disuse,” perhaps equivalent to ob- ob- + sol(ēre) “to be accustomed to” + -ēscere -esce
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.
1. archaic, obsolescent, obsolete 2. obsolescent, obsolete
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for obsolete

/ (ˈɒbsəˌliːt, ˌɒbsəˈliːt) /


out of use or practice; not current
out of date; unfashionable or outmoded
biology (of parts, organs, etc) vestigial; rudimentary
obsoletely, adverbobsoleteness, noun
C16: from Latin obsolētus worn out, past participle of obsolēre (unattested), from ob- opposite to + solēre to be used
The word obsoleteness is hardly ever used, obsolescence standing as the noun form for both obsolete and obsolescent
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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