Usage Note
Diecisiete is one of the fused teen numerals, alongside dieciséis, dieciocho and diecinueve. It follows the default penultimate stress rule and therefore carries no written accent. In older texts the three-word spelling diez y siete appears; the fused form is now standard.
Examples
"Hay diecisiete estudiantes en la clase."
Natural Translation
There are seventeen students in the class.

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