Something necessary or indispensable. es·sen′ti·al′i·ty (-shē-ăl′ĭ-tē), es·sen′tial·ness n.

What is the noun form of essential?

essentiality. The condition of being essential; a basic set of essential traits; being. An essential thing.

What is the vocabulary of essential?

Essential means very basic or necessary. A good frying pan is one of a short list of kitchen essentials every cook must have. To prevent fires, it's essential to turn off appliances before leaving the house. The adjective essential is often followed by to or that: It is essential to wash your hands.