above
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above-mentioned
Appearing further above in a text or already mentioned. Used mainly in written language.
Aus den obigen Ausführungen wird deutlich, dass eine schnelle Lösung nötig ist.
From the above explanations, it becomes clear that a quick solution is necessary.
The word 'obig' (above-mentioned) is used almost exclusively in written language. It sounds formal and is typical of letters, emails, reports, or academic texts.
Bitte überweisen Sie den Betrag auf das obige Konto.
Please transfer the amount to the above account.
'Obig' (above-mentioned) is derived from the adverb 'oben' (above). The ending '-ig' turns it into an adjective. So it literally means 'the one that is above'.
Der obige Verweis führt zu einer externen Webseite.
The above reference leads to an external website.
'Obig' (above-mentioned) is almost always used directly before a noun (attributively). It cannot really be used alone as a predicate. So you say 'der obige Satz' (the above sentence), but not 'Der Satz ist obig.'
Die in der obigen Tabelle genannten Zahlen sind vorläufig.
The figures given in the above table are preliminary.
mentioned
'erwähnt' and 'obig' can both refer back to something that has already been named in a text. 'erwähnt' is more general and also fits in conversations. 'obig' means that the information appears further above in the same text. It sounds more written and somewhat formal. In an email, a form, or a contract, 'obig' can be appropriate; in normal conversation, people are more likely to say 'wie erwähnt' (as mentioned) or 'schon genannt' (already named).
Bitte senden Sie die Unterlagen an die obige Adresse.
Please send the documents to the above address.
Wie erwähnt, verschieben wir den Termin wegen des Wetters.
As mentioned, we are postponing the appointment because of the weather.