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Comprehensive
Dictionary Suite
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all-important extremely important; absolutely necessary; indispensable.
cornerstone something basic and indispensable; foundation. [1/3 definitions]
essential fundamental; necessary; indispensable. [1/4 definitions]
integral indispensable; essential. [1/3 definitions]
lifeblood anything that gives life or animation to something; that which is indispensable. [1/2 definitions]
necessity a person or thing that is required or indispensable. [1/4 definitions]
need the lack of something that is required or indispensable. [1/10 definitions]
obligate indispensable; necessary. [1/3 definitions]
sine qua non (Latin) something necessary; indispensable item or condition.