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essential

/ɪˈsɛn.ʃəl/
noun

  1. A necessary ingredient.

  2. A fundamental ingredient.

adjective

  1. Necessary.

    Similar: indispensable

  2. Very important; of high importance.

    Similar: crucial

  3. Necessary for survival but not synthesized by the organism, thus needing to be ingested

Synonymscrucial, indispensable
Antonymsaccessorial, accidental, incidental, unnecessary, unneeded, adscititious

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