der Hunderter
hundred-euro note
A banknote worth 100 currency units, for example a 100-euro note.
Kannst du mir einen Hunderter wechseln?
Can you change a hundred-euro note for me?

hundred / hundred-euro note
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hundred-euro note
A banknote worth 100 currency units, for example a 100-euro note.
Kannst du mir einen Hunderter wechseln?
Can you change a hundred-euro note for me?

'Der Hunderter' is derived from the number 'hundert' (hundred). The ending '-er' is often used in German to form colloquial nouns from numbers, as in 'der Zehner' (ten-euro note / group of ten) or 'der Fünfer' (five-euro note / group of five).
Für den Automaten brauche ich einen Zehner, keinen Hunderter.
For the machine, I need a ten-euro note, not a hundred-euro note.
The word 'Hunderter' is mainly used in spoken language and in informal contexts. In formal texts, you would write, for example, 'Hundert-Euro-Schein' (hundred-euro note) or 'Hundertjähriger' (centenarian).
Hast du vielleicht einen Hunderter für mich? Ich gebe ihn dir morgen zurück.
Do you maybe have a hundred for me? I'll give it back to you tomorrow.
You can easily recognize the meaning from context: If it is about money and paying, it means a banknote. If it is about counting or quantities, it means the number 100. If it is about a person's age, it means a centenarian.
Ich habe an der Kasse mit einem Hunderter bezahlt. (Geldschein)
I paid at the checkout with a hundred-euro note. (banknote)
When a banknote is meant, 'Hunderter' is often used with verbs such as 'wechseln' (to change), 'bezahlen' (to pay), 'rausgeben' (to give change), or 'dabeihaben' (to have with you).
Entschuldigung, können Sie auf einen Hunderter rausgeben?
Excuse me, can you give change for a hundred-euro note?
In the meaning of 'Zahl 100' (number 100), the word is often used in compounds such as 'die Hunderter-Grenze' (the hundred threshold), 'die Hunderter-Marke' (the hundred mark), or 'der Hunderter-Bereich' (the hundreds range).
Die Zahl der Anmeldungen liegt schon im Hunderter-Bereich.
The number of registrations is already in the hundreds.
hundred
'hundert' and 'der Hunderter' both refer to the number 100. 'hundert' is the normal number and comes directly before a noun or stands alone as a number. 'Der Hunderter' is a noun. It can mean a 100-euro note or the number 100 as a unit, range, or threshold. The words can be confused because both point to 100. If you are simply counting or naming a quantity, use 'hundert'. If you are talking about a banknote, a number range, or 100 as a special threshold, 'Hunderter' fits.

An der Kasse konnte Tom nur mit einem Hunderter bezahlen.
At the checkout, Tom could only pay with a hundred-euro note.
Für das Konzert wurden schon hundert Karten verkauft.
A hundred tickets have already been sold for the concert.