obsolete UK /ˈɒbsəliːt/US /ˈɑbsəlit/adjective 2noun 1verb 1forms 5 adjective2 •No longer in use or no longer useful; now disused or neglected (often in favour of something newer, better, or more fashionable); outmoded.Speedy, worldwide, accessible delivery of news through the Web has made newspapers obsolete.Horses became obsolete means of transportation in cities in the first half of the twentieth century. •Imperfectly developed; not very distinct. noun1 •An obsolete thing or person. verb1 •To cause to become obsolete.This software component has been obsoleted.We are in the process of obsoleting this product. formsobsoleted · obsoleting · obsoletes · more obsolete · most obsolete