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essential (EN)
прилагательное, существительное

прилагательное “essential”

основа essential (more/most)
  1. необходимый
    Drinking clean water is essential for good health.
  2. существенный
    Freedom of speech is an essential principle of democracy.
  3. эфирный
    The essential oil from the lavender plant gives the soap its calming scent.
  4. незаменимый
    Certain amino acids are essential because our bodies cannot produce them.
  5. эссенциальный (медицина, возникающий без известной причины)
    The patient was diagnosed with essential tremor, which has no clear underlying cause.

существительное “essential”

ед. essential, мн. essentials
  1. необходимость
    Food and shelter are essentials for survival.
  2. основа (фундаментальный элемент)
    The course teaches the essentials of computer programming.