essential
adjective
uk/ɪˈsenʃəl/ usvery important or necessary:
Computer literacy is becoming as essential as the ability to drive a car.
an essential component/part of sth Selective expansion of our store base is an essential component of our long-term plan.
essential for sth Formulating new strategies is essential for preparing the corporation to meet and sustain future needs.
it is essential (that) It is essential our prices remain competitive.
it is essential to do sth It is essential to research and protect your patent.
essential to sth Knowledge, skills, and creativity are essential to creating high-value products.
essential
noun [ C, usually plural ]
uk/ɪˈsenʃəl/ usa basic thing that you cannot live or succeed without:
This leaflet will give you the essentials of how to use the word processor.
Goods that were once considered luxuries are now treated as essentials by many.