No longer in use; gone into disuse; disused; neglected; as, an obsolete word; an obsolete statute; -- applied chiefly to words, writings, or observances.
- No longer in use: an obsolete word.
- Outmoded in design, style, or construction: an obsolete locomotive.
- Biology Vestigial or imperfectly developed, especially in comparison with other individuals or related species; not clearly marked or seen; indistinct. Used of an organ or other part of an animal or plant.
- To cause to become obsolete.