numeral
seventeen
A1
siebzehn is the cardinal numeral seventeen. It’s formed by combining sieb- + zehn and follows regular German numeral patterns; ordinal siebzehnte. No plural; used for counting. The stem is truncated (sieb- instead of sieben) as in other teens and compounds (sieben→sieb- before suffixes).
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Meine Tochter ist siebzehn Jahre alt.
My daughter is seventeen years old.
Die Schule entschied, dass siebzehn Schüler zusätzlich Matheunterricht bekommen sollten, weil das Niveau zu unterschiedlich gewesen war.
The school decided that seventeen students should receive extra math lessons because the level had been too uneven.
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VOCABULARY.DETAILS.MNEMONICS
Picture a group of 17 students in a classroom line.
Sounds like 'seven-teen' — think 'seven' + 'teen'.