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Related to obsoletism: archaistic
1. No longer in use: an obsolete word.
2. Outmoded in design, style, or construction: an obsolete locomotive.
3. Biology Vestigial or rudimentary, especially in comparison with related or ancestral species, as the tailbone of an ape. Used of an organ or other part of an organism.
tr.v. ob·so·let·ed, ob·so·let·ing, ob·so·letes
To cause to become obsolete: "The textbook publishers use every trick known to the marketing mind to obsolete their products year after year, thus closing off the possibility of second-hand sales" (Thomas Frank).
[Latin obsolētus, past participle of obsolēscere, to fall into disuse; see obsolescent.]
a thing, esp a word or group of words, that has gone out of use or is out of date
a rare word for obsolescence