essential
/ɪˈsɛn.ʃəl/
Dictionary
noun
- A necessary ingredient.
- A fundamental ingredient.
adjective
- Necessary.
- Very important; of high importance.
- Necessary for survival but not synthesized by the organism, thus needing to be ingested
- Being in the basic form; showing its essence.
"Don’t mind him being grumpy. That’s the essential Fred."
- Really existing; existent.
- 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.
- Idiopathic.
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