English Reference
noun · verb

precaution

n. · v.
US /pɹiˈkɔʃən/ UK /pɹɪkˈɔːʃən/ pre·cau·tion UK spelling precaution's, precaution's, precautioning

  1. 01 B2 Upper Intermediate

    n.an action you take before something happens to prevent danger or trouble.

    n.a measure taken in advance to ward off potential danger, failure, or injury.

    Simple

    We took the precaution of locking all the windows before we left for our holiday.

    In context

    As a standard safety precaution, all laboratory personnel are required to wear protective eyewear regardless of the specific experiment being conducted.

    safeguardpreventative measureprovision
  2. 02 C1 Advanced Formal

    n.the quality of being careful and thinking about the future to avoid mistakes.

    n.the state or quality of employing caution beforehand to prevent misfortune.

    Simple

    He acted with great precaution when handling the fragile old documents.

    In context

    The surgeon proceeded with extreme precaution, aware that the slightest tremor could damage the surrounding nerve tissue.

    rashnessimprudence
  3. 03 C2 Proficiency ArchaicFormal

    v.to warn someone about a danger before it happens.

    v.to warn or caution a person in advance of a potential risk.

    Simple

    The captain precautioned the crew about the approaching storm.

    In context

    The legal advisor precautioned the board members against making any public statements before the contract was officially signed.

    Usage

    takes a direct object, often followed by 'against' or 'about'

    forewarnalert

Even though it may appear that the danger is over, you still need to take precautions.

The Local· 18 Aug 2026

It adds that if people are evacuated as a precaution and the property has not been damaged, temporary accommodation is typically arranged through the local authority.

BBC News· 14 Aug 2026

From French précaution, Latin praecautio, from praecavere, praecautum (“to guard against beforehand”); prae (“before”) + cavere (“be on one's guard”). See pre-, and caution.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated