This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Constituting or being part of the essence of something; inherent.

adj. Basic or indispensable; necessary: essential ingredients. See Synonyms at indispensable.

adj. Medicine Of, relating to, or being a dysfunctional condition or a disease whose cause is unknown: essential hypertension.

adj. Biochemistry Being a substance that is required for normal functioning but cannot be synthesized by the body and therefore must be included in the diet: essential amino acids.

n. Something fundamental.

n. Something necessary or indispensable.

adj. Necessary.

adj. Very important; of high importance.

adj. Being in the basic form; showing its essence.

adj. Such that each complementary region is irreducible, the boundary of each complementary region is incompressible by disks and monogons in the complementary region, and no leaf is a sphere or a torus bounding a solid torus in the manifold.

adj. Idiopathic.

n. A necessary ingredient.

n. A fundamental ingredient.

adj. Belonging to the essence, or that which makes an object, or class of objects, what it is.

adj. Hence, really existing; existent.

adj. Important in the highest degree; indispensable to the attainment of an object; indispensably necessary.

adj. Containing the essence or characteristic portion of a substance, as of a plant; highly rectified; pure; hence, unmixed.

adj. Necessary; indispensable; -- said of those tones which constitute a chord, in distinction from ornamental or passing tones.

adj. Idiopathic; independent of other diseases.

n. Existence; being.

n. That which is essential; first or constituent principle.

Involved in the essence, definition, or nature of a thing or of a word: as, an essential character; an essential quality.

Constituting or making that which is characteristic or most important in a thing; fundamental; indispensable: as, an essential feature of Shakspere's style.

Specifically, in medicine, idiopathic, not symptomatic merely.

Pertaining to or proceeding from an essence; of the nature of an essence or extract.

n. Existence; being.

n. A fundamental or constituent principle; a distinguishing characteristic.

In geology, noting those minerals of any species of rock which establish its character and which must be mentioned in its definition: contrasted with accessory.

adj. being or relating to or containing the essence of a plant etc

adj. of the greatest importance

adj. basic and fundamental

adj. absolutely necessary; vitally necessary

adj. defining rights and duties as opposed to giving the rules by which rights and duties are established

n. anything indispensable

"All the special interest mistresses are there - from Miss December the homemaker to Miss July, who gives a whole new meaning to the term essential oil."

important    of import    virtual    no-frills    vital    constituent    must    organic    life-sustaining    primary   

accessory    accident    adscititious    nonessential    incidental    inessential    unnecessary    unessential    accidental    accessorial   

necessary    essential notes    essential act    essential oil    essential breadth    essential whole    essential singular point    essential definition    essential character    essential singularity   

essence   

essential listening    essential oil    essential fatty acid    essential amino acid    essential nutrient    essentialness    quintessential    essentially   

existent    pure    necessary    indispensable    idiopathic    existence    being    substantial    constituting    constitutional   

confidential    consequential    credential    deferential    differential    existential    experiential    exponential    inconsequential    inferential   

necessary    important    vital    practical    safe    pharmacetical    changeof    toone    dead weight    neo-liberal