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ob·so·lete / ˌäbsəˈlēt/ • adj. 1. no longer produced or used; out of date: the disposal of old and obsolete machinery the phrase was obsolete after 1625. 2. Biol. (of a part or characteristic of an organism) less developed than formerly or in a related species; rudimentary; vestigial. • v. [tr.] cause (a product or idea) to be or become obsolete by replacing it with something new: we're trying to stimulate the business by obsoleting last year's designs. DERIVATIVES: ob·so·lete·ly adv. ob·so·lete·ness n. ob·so·let·ism / -ˈlēˌtizəm/ n.