essential

IPA: ɪsˈɛnʃʌɫ

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.
Really existing; existent.
(geometry) 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.
(medicine) Idiopathic.
Having the nature of essence; not physical.

Examples of "essential" in Sentences

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