Etymology
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obsolete (adj.)

"that is no longer practiced or used, out of date, gone out of use, of a discarded type," 1570s, from Latin obsoletus "grown old, worn-out," past participle of obsolescere "fall into disuse, be forgotten about, become tarnished," which probably is from ob "away" (see ob-) + an expanded form of solere "to be used to, be accustomed" (see insolent).

Origin and meaning of obsolete

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Definitions of obsolete

obsolete (adj.)
no longer in use;
obsolete words
Synonyms: disused
From wordnet.princeton.edu