<p><strong>Adjective</strong></p><ul><li>no longer in general use; fallen into disuse: an obsolete expression.</li><li>of a discarded or outmoded type; out of date: an obsolete battleship.</li><li>(of a linguistic form) no longer in use, especially, out of use for at least the past century.</li><li>effaced by wearing down or away.</li><li>imperfectly developed or rudimentary in comparison with the corresponding character in other individuals, as of a different sex or of a related species.</li></ul><p><strong>Verb</strong></p><ul><li>to make obsolete by replacing with something newer or better; antiquate: Automation has obsoleted many factory workers.</li></ul>