English Reference
noun

necessity

n.
US /nəˈsɛsəti/ UK /nəsˈɛsɪti/ ne·ces·si·ty UK spelling necessities

  1. 01 B2 Upper Intermediate

    the fact that something must happen or be done.

    the quality or state of being unavoidable or absolutely requisite.

    Simple

    The necessity of regular exercise for good health is well known.

    In context

    The sudden economic downturn highlighted the necessity of maintaining a robust emergency fund for unforeseen corporate expenses.

  2. 02 B2 Upper Intermediate

    something that you must have, such as food, water, or medicine.

    an indispensable item or requirement, especially for survival or a specific purpose.

    Simple

    A warm coat is a necessity if you plan to visit the mountains in winter.

    In context

    In many remote regions, access to clean drinking water remains a basic necessity that is unfortunately not yet guaranteed for all residents.

  3. 03 C1 Advanced TechnicalFormal Law

    a reason used in court to explain why someone broke a law to prevent something worse from happening.

    a defence in tort or criminal law justifying an otherwise illegal act on the grounds that it prevented a greater harm.

    Simple

    The driver claimed necessity after speeding to get a critically injured person to the hospital.

    In context

    The court had to determine whether the defendant's actions met the strict legal criteria for a necessity defence during the emergency evacuation.

    Usage

    Often used as a legal defence in the phrase 'defence of necessity'.

  4. 04 C2 Proficiency LiteraryArchaic

    a state of being very poor and not having the things you need.

    the condition of being in desperate need or experiencing extreme poverty.

    Simple

    The family lived in great necessity after the factory closed down.

    In context

    The novel depicts the harsh realities of those driven to desperate measures by the sheer weight of necessity and social neglect.

    povertydestitutionprivation

The disaster response, however, is entering a new phase as rescue teams wind down operations and aid organisations begin focusing on housing those made homeless by the earthquake and providing basic necessities.

Al Jazeera· 17 Aug 2026

Equally important is the necessity of honoring victims by remembering them, by giving them their names back.

JSTOR Daily· 3 Aug 2026

From Middle English necessite, from Old French necessite, from Latin necessitās (“unavoidableness, compulsion, exigency, necessity”), from necesse (“unavoidable, inevitable”); see necessary. Doublet of Necessitas.

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

This entry
Origin Latin necessitās
Level B2 · Upper Intermediate
Frequency Frequent
Updated