1. A programming language or human language that is no longer in common use or has been replaced by newer alternatives
COBOL is considered an obsolete language by many modern programmers.
COBOL é considerada uma linguagem obsoleta por muitos programadores modernos.
2. Outdated or archaic vocabulary, grammar, or expressions no longer used in contemporary communication
The use of 'thee' and 'thou' represents obsolete language in English.
O uso de 'thee' e 'thou' representa linguagem obsoleta em inglês.