Indispensable, necessary, requisite, required,important, imperative, vital, material, quintessential: Astrong defence is essential to peace.
Fundamental, basic,intrinsic, elemental, elementary, principal, primary, key, main,leading, chief: Yeast or baking powder is an essentialingredient of bread.
Oxford
Adj. & n.
Adj.
Absolutely necessary; indispensable.
Fundamental, basic.
Of or constituting the essence of aperson or thing.
(of a disease) with no known externalstimulus or cause; idiopathic.
N. (esp. in pl.) a basic orindispensable element or thing.
Essential element any ofvarious elements required by living organisms for normal growth.essential oil a volatile oil derived from a plant etc. with itscharacteristic odour.
Essentiality n. essentially adv.essentialness n. [ME f. LL essentialis (as ESSENCE)]
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