essential

Definitions

Absolutely necessary; extremely important.

Of or relating to the intrinsic nature or indispensable quality of something.

A fundamental element or characteristic.

Examples

Water is essential for the survival of all living organisms.

Good communication is an essential skill for any successful manager.

It is essential that you arrive at the airport at least two hours before your flight.

Synonyms

crucial vital fundamental necessary indispensable pivotal imperative

Antonyms

optional unnecessary inessential trivial superfluous nonessential dispensable