Proof
Noun
UK
/pruːf/
US
/pruːf/
Level: b1
Definition
Evidence or facts that show something is true or correct.
Example
"He showed proof of payment at the customer service desk."
"The police asked for proof that he was at another place during the incident."
"Scientific experiments provide proof by testing ideas carefully and showing clear results that others can check."
Explanation
Proof is evidence or information that shows something is true or correct. It helps remove doubt and makes people believe or accept a fact. Proof can be documents, pictures, numbers, or logical reasons. For example, you may show proof of identity or proof of payment. In school, proof can also mean showing all the steps of your work to explain how you got an answer, especially in maths. Without proof, claims may not be trusted or accepted.