Definition of “essence” - Learner’s Dictionary

essence

noun uk us /ˈesəns/
BASIC QUALITY [ U, no plural ]

the basic or most important idea or quality of something:

The essence of his argument is that we should not eat meat.
LIQUID [ C, U ]

a strong liquid, usually made from a plant or flower, that is used to add a flavour or smell to something:

vanilla essence

(Definition of “essence” from the Cambridge Learner's Dictionary © Cambridge University Press)