Longman Dictionary of Contemporary English homepage

indispensable

 adjective
     
in‧di‧spen‧sa‧ble
someone or something that is indispensable is so important or useful that it is impossible to manage without them [= essential]
indispensable to
This book is indispensable to anyone interested in space exploration.
indispensable for/in (doing) something
Meat is not indispensable for maintaining a healthy diet.
Mobile phones have become an indispensable part of our lives.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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