essential

US /ɪˈsen.ʃəl/
UK /ɪˈsen.ʃəl/
"essential" picture
1.

absolutely necessary or important

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Water is essential for life.
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It's essential that you follow these instructions carefully.
:
crucialvitalindispensablefundamentalkey
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unnecessaryinessentialdispensable
2.

of the nature of an essence; inherent

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The essential difference between the two theories lies in their assumptions.
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His essential nature was kind and generous.
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inherentintrinsicfundamentalbasicprimary
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accidentalsuperficialextrinsic
1.

an essential thing

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We packed only the essentials for our trip.
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The course covers all the essentials of programming.
:
necessitiesbasicsfundamentalsrequirementsstaples
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non-essentialssuperfluities
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essentiallyessential oilnon-essential