verifier

Everyday

1. A person who checks that something is true, correct or real. tree →
2. (computing) A program or tool that checks automatically whether something is correct, such as a password, a document or the answer to a problem. tree →

In the lessons

Used in computing, science and official work. A fact verifier checks facts in news stories; an age verifier checks how old someone is before they use a website. In maths and computing, a verifier checks a proof or an answer. It comes from "verify" (to check that something is true).

Examples

• The verifier checked that the signature was real. tree →
• A computer verifier checked all our answers in seconds. tree →
• Fact verifiers make sure the news report is true. tree →
• The website uses an age verifier before you can sign up. tree →
• A proof verifier can check that each step of a maths proof follows the rules. tree →
• The ticket verifier scanned my code at the gate. tree →

Note

Countable: a verifier, verifiers. Built from "verify" plus -er (y changes to i). Related words: verify, verification, verified. A verifier only checks; it does not create the answer.