Por cierto, tu suposición sobre su edad estaba completamente equivocada.
English: Your assumption about her age was completely wrong, by the way.
suposición /sˌuposiθjˈon/ · noun · CEFR B2. Spanish translation of "assumption".
See also: Vocabulary entry (Spanish)

Listen to how "suposición" sounds in Spanish.
Spanish article/gender note: learn this word with the article "la".
| Dictionary form | suposición |
|---|---|
| Article | la |
| Gender/article class | feminine |
| Regular/likely plural | suposiciónes |
Por cierto, tu suposición sobre su edad estaba completamente equivocada.
English: Your assumption about her age was completely wrong, by the way.
Muchas suposiciones en este informe deben probarse con cuidado.
English: Many assumptions in this report need to be carefully tested.
Todo el plan se basa en la suposición de que los precios bajarán.
English: The whole plan rests on the assumption that prices will fall.
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