essence
n.-
1 the core nature (n.) B2 Upper Intermediatethe most important quality or feature of something that makes it what it is.
the intrinsic nature or indispensable quality of something, especially something abstract, that determines its character.
ExampleThe essence of his argument was that we need to protect the environment for our children.
ExampleThe artist managed to capture the very essence of the rugged coastline using only a few bold strokes of charcoal.
UsageOften used in the phrase 'in essence' to summarise a complex point.
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2 a concentrate (n.) C1 Advanced Technical Cookinga strong liquid taken from a plant or food, used for its smell or taste.
a concentrated substance or extract obtained from a plant, drug, or foodstuff by distillation or similar processes.
ExampleAdd two drops of vanilla essence to the cake mixture for a better flavour.
ExampleThe recipe requires a high-quality almond essence, as synthetic substitutes often fail to provide the necessary depth of aroma.
UsageCommonly used in culinary and pharmaceutical contexts.
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3 time is of the essence (n.) C1 Advanced Formal Lawused to say that something is extremely important and must be done quickly.
a fixed idiomatic expression indicating that a particular factor, usually time, is a critical requirement.
ExamplePlease send the documents immediately because time is of the essence.
ExampleIn emergency surgery, time is of the essence, and every second saved increases the patient's chances of a full recovery.
Teacher's tipThis is almost exclusively used with 'time' in professional or legal contexts.
From Middle English essence, from Middle French essence, from Latin essentia (“the being or essence of a thing”), from an artificial formation of esse (“to be”), to translate Ancient Greek οὐσία (ousía, “being”), from ὤν (ṓn), present participle of εἰμί (eimí, “to be, exist”).