abermals
again
One more time; again. Often used in a more formal or written context.
Nachdem er durch die erste Prüfung gefallen war, versuchte er es abermals.
After he had failed the first exam, he tried it again.

again
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again
One more time; again. Often used in a more formal or written context.
Nachdem er durch die erste Prüfung gefallen war, versuchte er es abermals.
After he had failed the first exam, he tried it again.

The word is made up of 'aber' and the old ending '-mals', which refers to 'Mal' (in the sense of 'time'). So it literally means something like 'one more time'.
Er hat die Prüfung nicht bestanden und muss sie nun abermals wiederholen.
He did not pass the exam and now has to repeat it again.
As an adverb, 'abermals' (again) can stand at the beginning of a sentence (position 1), which causes inversion (verb in position 2). It can also stand after the verb in the middle of the sentence.
Abermals stand er vor verschlossener Tür.
Once again, he found himself standing in front of a locked door.
'Abermals' (again) belongs to written language and is perceived as elevated or formal. In everyday spoken language, it often sounds unnatural or literary.
Der Held der Geschichte musste sich abermals einer großen Gefahr stellen.
The hero of the story had to face a great danger once again.
again / back
'wieder' and 'abermals' both mean that something happens again. The most important difference is style. 'wieder' is neutral and very normal in everyday language. 'abermals' sounds more formal and more written, for example in news, reports, or official texts. In normal conversation, you would usually say 'wieder'. 'abermals' fits when the sentence should sound a bit more serious or more written.

In der Nachbarschaft hat sie abermals um Hilfe gebeten.
She has asked for help in the neighborhood again.
Nach der Nachricht plant das Team wieder einen kurzen Termin.
After the news, the team is planning another short meeting.