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essential (EN)
adjective, noun

adjective “essential”

base form essential (more/most)
  1. absolutely necessary; extremely important
    Drinking clean water is essential for good health.
  2. relating to the inherent nature or essence of something
    Freedom of speech is an essential principle of democracy.
  3. related to essence, a liquid taken from a plant that gives it its smell or taste
    The essential oil from the lavender plant gives the soap its calming scent.
  4. (biology) not being able to be made by the body and having to be obtained from the diet
    Certain amino acids are essential because our bodies cannot produce them.
  5. (medicine) occurring without a known cause
    The patient was diagnosed with essential tremor, which has no clear underlying cause.

noun “essential”

singular essential, plural essentials
  1. something that is absolutely necessary
    Food and shelter are essentials for survival.
  2. a fundamental or basic element
    The course teaches the essentials of computer programming.