Adoption vs Assumption

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

Adoption

Top 3,000 (common)C1noun

Assumption

Top 2,000 (common)B2noun
Most common: Assumption
 AdoptionAssumption
Pronunciation🇬🇧 /["/əˈdɒpʃn/"]/🇺🇸 /["/əˈdɑːpʃn/"]/🇬🇧 /["/əˈsʌmpʃn/"]/🇺🇸 /["/əˈsʌmpʃn/"]/
MeaningThe act of taking something as your own, especially a child.Something you think is true without proof.
ExampleShe put the baby up for adoption.Her assumption that everyone would agree was proven wrong.
RegisterNeutralNeutral
How commonTop 3,000 (common)Top 2,000 (common)
CEFR levelC1B2
Part of speechnounnoun
Collocationsoffer somebody for, place somebody for, put somebody up for, go through, agency, general, widespread, formal, recommend, urgebasic, fundamental, key, number, series, set, make, base something on, start from, underlie something, underpin something, on the assumption that, assumption about
Antonymsabandonment, rejectionfact, certainty, truth
Common mistakesConfused with 'adaptation' - They are different concepts., Using 'adopt' incorrectly - Remember 'adopt' requires an object., Mixing up 'adoption' and 'acceptance' - They have different meanings.Confusing 'assumption' with 'presumption', which has slightly different legal meanings., Using it without a specific subject ('the assumption of...'), Mispronouncing it as 'assumpt-tion' instead of 'assump-tion'.
Usage notesUse 'adoption' in formal and neutral contexts, such as legal discussions or when speaking about families. Avoid in slang and informal speech.Use '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.

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Assumption

Frequently asked questions: Adoption vs Assumption

What's the difference between Adoption and Assumption?

Adoption: The act of taking something as your own, especially a child. Assumption: Something you think is true without proof.

Which is more common: Adoption and Assumption?

Assumption is the most common in everyday English.

Which is more advanced: Adoption and Assumption?

Adoption is the highest level, at C1, on the CEFR scale.

Are Adoption and Assumption the same CEFR level?

Adoption: C1, Assumption: B2 on the CEFR scale.

What part of speech are Adoption and Assumption?

Adoption: noun, Assumption: noun.

Can you show an example of each?

Adoption: She put the baby up for adoption. Assumption: Her assumption that everyone would agree was proven wrong.

Can I use Adoption and Assumption interchangeably?

Not always. Adoption and Assumption are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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