1. A subject, matter, or topic that is no longer relevant, current, or in use; something that has become outdated or antiquated
That debate about dial-up internet is an obsolete topic now that broadband is ubiquitous.
Aquele debate sobre internet discada é um assunto obsoleto agora que a banda larga é onipresente.
2. A discussion or concern that has lost its importance or timeliness in contemporary discourse
The advantages of VHS tapes have become an obsolete topic.
As vantagens das fitas VHS se tornaram um assunto obsoleto.