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English definition of “essential”

essential

adjective uk   /ɪˈsen.ʃəl/ us  
B1 necessary or needed: Government support will be essential if the project is to succeed. There is essential work to be done before the building can be re-occupied. Water is essential for/to living things. It is essential (that) our prices remain competitive. [+ to infinitive] For the experiment to be valid, it is essential to record the data accurately.

essential

noun [C usually plural] uk   /ɪˈsen.ʃəl/ us  
a basic thing that you cannot live without: Because I live in a remote village, I regard my car as an essential. When we go on holiday, we only take the bare essentials. This leaflet will give you the essentials of how to use the word processor.
(Definition of essential from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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