1. outdated, old-fashioned, or ancient methods, customs, or procedures that are no longer commonly used
The company abandoned its archaic practices in favor of modern technology.
A empresa abandonou suas práticas arcaicas em favor da tecnologia moderna.
2. traditional customs or methods from an earlier historical period that persist despite being obsolete
Many legal systems still contain archaic practices dating back centuries.
Muitos sistemas legais ainda contêm práticas arcaicas que datam de séculos atrás.