1. A version of something, especially language, a document, or a procedure, that is no longer current or in common use
The old spelling is now considered an outdated form.
A ortografia antiga agora é considerada uma forma desatualizada.
2. A grammatical or linguistic structure that is no longer used in modern language
Thou art is an outdated form of modern English.
Thou art é uma forma desatualizada do inglês moderno.