(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 quality of being essential; essentiality.

plural of essentializer