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

n the condition of being essential or indispensable

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the state of being absolutely required
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

n anything indispensable

“food and shelter are necessities of life”
essential, necessary, requirement, requisite
inessential, nonessential
anything that is not essential
something desired as a necessity
a necessary or essential thing
need, want
anything that is necessary but lacking
Type of:
a separate and self-contained entity

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