essential
🇺🇸
/ɪˈsenʃl/
🇬🇧
/ɪˈsenʃl/
completely necessary or very important
Water is essential for all living things to survive.
relating to the most basic or important part of something
The essential quality of a good leader is honesty.
something that is absolutely necessary
Food, water, and shelter are essential for human survival.
the most important basic knowledge about something
Learning the essentials of cooking is essential for living independently.