Assumption vs Expectation

When to use each in English, with meaning, register, and examples.

 AssumptionExpectation
MeaningSomething you think is true without proof.A belief about what will happen in the future.
CEFR levelB2B2
Part of speechnounnoun
Usage notesUse 'assumption' when discussing beliefs or ideas that are taken for granted. It is appropriate in both written and spoken contexts, especially in discussions related to reasoning or theories. Avoid using it in very casual conversations.Typically used in both spoken and written English. Use in formal contexts, such as business or academic writing, when discussing predictions or assumptions. Avoid in casual conversation unless referring to personal hopes.

Frequently asked questions: Assumption vs Expectation

What's the difference between "Assumption" and "Expectation"?

"Assumption" means: Something you think is true without proof. "Expectation" means: A belief about what will happen in the future.

When should I use "Assumption" and "Expectation"?

They can all be used in everyday English.

Are "Assumption" and "Expectation" the same CEFR level?

"Assumption" is at B2, "Expectation" is at B2 on the CEFR scale.

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