nochmals
again
One more time; repeatedly. It is used to express that something happens or is said a second or further time.
Könnten Sie das bitte nochmals langsam wiederholen?
Could you please repeat that again slowly?

again
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again
One more time; repeatedly. It is used to express that something happens or is said a second or further time.
Könnten Sie das bitte nochmals langsam wiederholen?
Could you please repeat that again slowly?

'Nochmals' is a formal variant formed from 'noch' and 'mal' with an adverbial '-s' at the end, similar to 'abends' (in the evenings) or 'morgens' (in the mornings).
Ich möchte mich nochmals für die Einladung bedanken.
I would like to thank you again for the invitation.
As an adverb, 'nochmals' can stand at the beginning of the sentence (position 1), which reverses the word order (verb in position 2). But it can also stand in the middle of the sentence.
Nochmals vielen Dank für Ihre Mühe.
Once again, many thanks for your effort.
In the meaning 'zusätzlich' (additionally), 'nochmals' is often used in formal communication such as speeches or letters to reinforce or summarize a point.
Abschließend möchte ich nochmals betonen, dass wir mit der Entwicklung sehr zufrieden sind.
In conclusion, I would like to emphasize once again that we are very satisfied with the development.
again / back
'wieder' and 'nochmals' can both mean that something happens one more time. 'wieder' is very general and fits almost all everyday situations. 'nochmals' sounds a little more precise and often more polite or formal, especially when someone says, explains, checks, or asks for something again. In addition, 'nochmals' can introduce an additional point or reinforcement. In normal conversation, 'wieder' is usually more natural; in a message, request, or explanation, 'nochmals' often sounds appropriate.

Beim Termin erklärt Frau Kaya nochmals, welche Unterlagen fehlen.
At the appointment, Ms. Kaya explains again which documents are missing.
Heute übt die Klasse wieder für die Aufführung.
Today the class is practicing again for the performance.