English Reference
adjective · verb

defining

adj. · v.
US /dɪˈfaɪnɪŋ/ UK /dɪfˈaɪnɪŋ/ defin·ing

  1. 01 B2 Upper Intermediate

    adj.describing the most important feature that makes something what it is.

    adj.serving to define or distinguish the essential nature of a person, group, or period.

    Simple

    The invention of the smartphone was a defining moment for modern technology.

    In context

    The architect's use of sustainable materials became the defining characteristic of her later work, setting her apart from her contemporaries.

    Usage

    Usually placed before the noun it describes.

  2. 02 B2 Upper Intermediate

    v.the act of explaining what a word means or deciding the limits of something.

    v.the present participle of 'define', referring to the act of stating a precise meaning or establishing boundaries.

    Simple

    The committee is still defining the rules for the new competition.

    In context

    By clearly defining the scope of the project at the outset, the manager successfully avoided the common trap of scope creep during the implementation phase.

Usage defining feature

The defining British stars of recent years – PinkPantheress, Raye, Lola Young – have all been, in some part, forged in the fires of TikTok.

The Guardian· 23 Aug 2026

The goal was to keep one rough week from defining a semester.

The Conversation· 20 Jul 2026
This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated