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certify

B2
Fairly common

Pronunciation

UK

  • /sˈɜːtɪfˌaɪ/

US

  • /ˈsɜrtəˌfaɪ/

Meanings

Verb

  1. to officially confirm in writing that something is true, valid, or genuine

  2. to formally state that a person, product, organization, or process meets required standards

  3. to guarantee that a check or payment instrument is valid and backed by funds

More meanings
  1. to legally or medically declare someone mentally ill or otherwise unfit

Beyond the definition

Imagine you've spent years learning to fly an airplane. You don't just say you can pilot it—you need an authorized examiner or agency to certify your skills, meaning they formally acknowledge and confirm that you meet the required standards. That's the essence of "to certify": to officially declare that something is true, accurate, or meets a specific requirement.

You might see a mechanic certify that a car has passed inspection, or a school certify that a student has completed a course. It is about providing official validation. Sometimes it carries extra weight—like a jeweler certifying the authenticity of a diamond. Think of it as an official stamp of approval that builds trust.

Examples

  1. 1

    Medical leave

    The doctor certified that he was unfit for work for two weeks.

  2. 2

    Teaching qualification

    You need to be certified to teach in public schools.

    • Patternbe certified to do X

      have official approval or qualifications to do it

  3. 3

    Official copy

    Please bring a certified copy of your passport to the interview.

    • Phrasea certified copy

      a copy that has been officially checked and accepted as true

  4. 4

    Safety inspection

    The inspector certified the building as safe after the repairs.

    • Patterncertify X as Y

      officially state that X has that status

More examples
  1. 5

    Organic status

    The farm is certified organic.

See also

Similar

Shades of meaning

Contrast

Used with (collocations)

  • certify that
  • certify compliance
  • certify a copy
  • certify someone as qualified

Word family

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Forms and spellings

4 forms open this card.

Main spelling

  • certifyverb

Forms

  • certifiedpast tenseverb
  • certifying-ing formverb
  • certifiesverb