assumption - Master This Word

assumption Word Meanings

• something that is accepted as true without proof
• a belief about something that is not based on concrete evidence
• an idea or statement taken for granted

assumption Example Sentences

Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.

• His assumption was wrong.
• She made an assumption about him.
• Don't jump to an assumption too quickly.
• My assumption turned out to be true.
• We need to check our assumption first.

assumption Word Etymology

assumption = ad- (to) + sumere (take) → Latin → Old French → English. Picture a person assuming a role by taking a seat in a chair, portraying confidence and responsibility. This links to the idea of taking something for granted without questioning.

English Brain Route

I push my coffee mug along the desk, it slides to the edge and turns as gravity takes over. I shift my plan in my mind, letting a thought settle before I test it against what I can see. The move feels tentative, like adjusting a hinge, and I hold back other ideas as the room changes around me. In that moment of keeping faith in what seems true, an assumption slips into my thinking—an unspoken belief that shapes how I act next, without proofs on the table.

Real Context

Assumption is something accepted as true without proof, or a belief about something not based on concrete evidence. It can shape how we reason, plan, and argue, because we treat an idea as given rather than tested. People often make assumptions about others, about outcomes, or about how events will unfold, and those quick judgments can be useful starting points but risky if left unverified. The word comes from Latin sumere, through Old French, and in English it picked up the sense of taking something for granted. Picture someone seating themselves with confidence as if the matter were already decided.

Usage Reminders

• Make explicit when you base a claim on an assumption.
• Distinguish between assume (verb) and assumption (noun).
• Use 'assumption' with phrases like 'based on the assumption' or 'an assumption about'.
• Avoid treating untested beliefs as proven facts.
• In formal writing, state your assumption clearly and justify it with evidence when possible.

Common Misconceptions

• Assumptions are facts.
• Assumption and hypothesis are the same thing.
• You should never test an assumption.
• Making an assumption about people is always acceptable.
• More assumptions mean better decisions.

Thinking Differences

English learners should note that 'assumption' often carries a judgmental nuance when someone acts on it; the verb 'assume' is common in everyday speech, while 'assumption' is more formal or abstract.

Learning Tips

• Keep a notebook of common collocations: make an assumption, based on an assumption, challenge assumptions.
• Differentiate between 'assume' (verb) and 'assumption' (noun).
• Use 'assumption' in formal writing to state a premise explicitly.
• Identify assumptions in arguments and test them with evidence.
• Differentiate 'assumption' from 'hypothesis' and 'presumption'.
• Practice spotting unverified beliefs in conversations and texts.

5-Step Learning Method - Learn English in English

Related Listening

🔥 Advanced

🔥 Advanced

Managing a Polluted Estuary at Night

Environment & Pollution

2026.03.13 · 1:18 · B2 · IELTS

Listen Now

🔥 Advanced

Thoughts on Class and Community

Opinion & Ideas

2026.03.02 · 1:26 · B2 · IELTS

Listen Now