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How to Say "assumption" in Spanish

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suposición

nounB1general
Use 'suposición' when you are talking about a belief or idea that you hold without concrete proof, emphasizing the lack of certainty.

Examples

Es solo una suposición, no tengo pruebas todavía.

It is just an assumption; I don't have proof yet.

supuesto

/soo-PWEHS-toh//suˈpwesto/

nounB1general
Use 'supuesto' when referring to a premise or a starting point that is taken as true for the sake of an argument or plan, often implying a shared understanding.
A single, smooth stone pedestal standing alone on green grass, ready to support a future structure, symbolizing a foundational assumption.

Examples

Partimos del supuesto de que todos los invitados vendrán.

We're starting from the assumption that all the guests will come.

En el supuesto de que llueva, cancelaremos el picnic.

In the event that it rains, we will cancel the picnic.

A Special Verb Form for Hypotheticals

The phrase 'en el supuesto de que' (in the event that) signals a hypothetical situation. Because it's not a fact, the verb that follows often changes into a special 'what if' form called the subjunctive. For example: 'En el supuesto de que venga...' (In the event that he comes...).

Suposición vs. Supuesto

Learners often confuse 'suposición' and 'supuesto' because both relate to ideas taken as true. The key difference is that 'suposición' highlights the *lack* of proof or certainty, while 'supuesto' often refers to a foundational belief or premise upon which something else is built.

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