essential

B2 · Upper Intermediate

adj. relating to the most basic and important part of something.

adj. relating to the essence or fundamental nature of a person, thing, or concept.

“The essential difference between the two cars is the engine size.”

“The artist's work captures the essential spirit of the countryside without relying on traditional landscape techniques.”

C1 · Advanced Science Technical

adj. describing a nutrient that your body needs but cannot make itself, so you must eat it.

adj. denoting a nutrient, such as an amino acid or fatty acid, that is required for normal physiological function but cannot be synthesized by the body.

“Leafy greens provide many of the essential vitamins our bodies need.”

“There are nine essential amino acids that humans must obtain through their diet because the body lacks the metabolic pathways to produce them.”

B1 · Intermediate Countable noun

n. a basic thing that you cannot live or work without.

n. a fundamental element or a basic necessity required for a particular purpose.

“We only packed the essentials like water, a map, and a first-aid kit.”

“The relief agency focused on providing essentials such as clean water and temporary shelter to the displaced families.”