English Reference
adverb

strictly

adv.
US /ˈstɹɪktɫi/ UK /stɹˈɪktli/ strict·ly

  1. 01 B2 Upper Intermediate

    in a way that follows rules or orders exactly without any changes.

    in a manner that demands total obedience or rigorous adherence to established rules or standards.

    Simple

    The school rules are strictly enforced to ensure all students stay safe.

    In context

    The laboratory protocols must be strictly followed to prevent cross-contamination between the sensitive biological samples.

    Usage

    Often modifies verbs like 'enforce', 'follow', or 'prohibit'.

    rigorouslypreciselystringently
    looselyleniently
  2. 02 B2 Upper Intermediate

    used to say that something is for one purpose or group only.

    used to indicate that a statement or condition applies exclusively to a specific person, group, or activity.

    Simple

    This parking area is strictly for staff members with a valid permit.

    In context

    The funds were strictly allocated for infrastructure repairs, meaning they could not be diverted to cover administrative salaries.

    Usage

    Commonly used with 'for' or 'limited to'.

  3. 03 C1 Advanced Formal

    used when you are talking about the exact or literal meaning of a word.

    used to indicate that a word or phrase is being used in its most precise, literal, or technical sense.

    Simple

    Strictly speaking, a tomato is a fruit, not a vegetable.

    In context

    Strictly speaking, the agreement is not a treaty but a memorandum of understanding between the two departments.

    Usage

    Frequently appears in the fixed phrase 'strictly speaking'.

  4. 04 C2 Proficiency Technical Math

    in math, used to show that one value is always greater or smaller than another, never equal.

    describing a relationship where an inequality holds without the possibility of equality.

    Simple

    The function is strictly increasing, so the line always goes up.

    In context

    A strictly monotonic function ensures that for any two distinct points in the domain, their images are also distinct.

    Usage

    Typically modifies adjectives like 'increasing', 'decreasing', 'greater than', or 'less than'.

Usage strictly prohibited · strictly adhere · strictly control

Cofnas’s research activities in the role have been “strictly limited to the research topics for which the appointment was made”.

The Guardian· 30 Aug 2026

It was the biggest use of the system to date - but Dowden has now weighed in to question whether it was strictly necessary.

BBC News· 29 Aug 2026

From strict + -ly.

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

This entry
Level B2 · Upper Intermediate
Frequency Common
Updated