necessity

A good camping knife is a necessity if you’re going to be hiking in a heavily forested region. A necessity is something that you must have in order to complete a task.

When used in the plural, necessities are items required for a situation but nothing extra. You probably only bring the bare necessities to a sleepover — pajamas and a toothbrush. Sometimes a necessity is a thing you must know how to do. Knowing how to balance your checkbook is a financial necessity. In some cases, necessity simply means "need." Do you do your homework out of necessity or because you want to?

Definitions of necessity
  1. noun
    the condition of being essential or indispensable
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    types:
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    requisiteness
    the state of being absolutely required
    urgency
    the state of being urgent; an earnest and insistent necessity
    haste, hurry
    a condition of urgency making it necessary to hurry
    imperativeness, insistence, insistency, press, pressure
    the state of demanding notice or attention
    criticality, criticalness, cruciality
    a state of critical urgency
    type of:
    demand, need
    a condition requiring relief
  2. noun
    anything indispensable
    “food and shelter are necessities of life”
    synonyms: essential, necessary, requirement, requisite
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    Antonyms:
    inessential, nonessential
    anything that is not essential
    types:
    desideratum
    something desired as a necessity
    must
    a necessary or essential thing
    need, want
    anything that is necessary but lacking
    type of:
    thing
    a separate and self-contained entity
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