/ɪˈsenʃl/
ADJ. Something that is essential is extremely important or absolutely necessary to a particular subject, situation, or activity;
- essential (to/for sth);
- essential (to do sth);
- essential (that…) completely necessary;
- Money is not essential to happiness; 至关重要的
- Experience is essential for this job;
- Essential services such as gas, water, and electricity;
- Even in small companies, computers are an essential tool;
- Good design is essential;
- Love is essential, gregariousness is optional.
N-COUNT The essentials are the things that are absolutely necessary for the situation you are in or for the task you are doing.