Noun

• S: (n) indispensability, indispensableness, vitalness (the quality possessed by something that you cannot possibly do without)
• direct hypernym / inherited hypernym / sister term
• S: (n) essentiality, essentialness (basic importance)
• S: (n) vitalness (the quality of being essential to maintain life)
• S: (n) indispensability, indispensableness, vitalness (the quality possessed by something that you cannot possibly do without)
• antonym
• derivationally related form
• W: (adj) indispensable [Related to: indispensability, indispensableness, vitalness] (absolutely necessary; vitally necessary) "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"
• W: (adj) indispensable [Related to: indispensability, indispensableness] (not to be dispensed with; essential) "foods indispensable to good nutrition"
• W: (adj) vital [Related to: vitalness] (performing an essential function in the living body) "vital organs"; "blood and other vital fluids"; "the loss of vital heat in shock"; "a vital spot"; "life-giving love and praise"