(intransitive) To become assimilated / (transitive) To form or constitute the essence or being of.

in essence

A necessary ingredient. / A fundamental ingredient.

Necessary. / Very important; of high importance. / (biology) Necessary for survival but not synthesized by the organism, thus needing to be ingested. / Being in the basic form; showing its essence.

(by extension) The information required to have a basic understanding of a topic.

plural of essential

(philosophy) The view that objects have properties that are essential to them.

simple past tense and past participle of essentiate

The process of essentializing.

The quality of being essential; essentiality.