One who or that which reduces something to its essence.

A volatile oil, used to make perfumes and flavourings, especially one having the characteristic odour of the plant from which it is obtained.

(nutrition) A compound that must be obtained from food for survival

plural of essential oil

Alternative spelling of nonessential.

(mathematical analysis) The supremum (least upper bound) of a function which holds almost everywhere. In symbols, ess sup f= inf M:𝜇(x:f(x)>M)=0

(mathematical analysis) The infimum (greatest lower bound) of a function which holds almost everywhere. In symbols, ess inf f= sup m:𝜇(x:f(x)<m)=0.

(medicine, chiefly uncountable) A neurological condition that causes rhythmic shaking of unknown cause in one or more parts of the body during voluntary movements.

(medicine) a rare chronic blood disorder characterised by the overproduction of platelets by megakaryocytes in the bone marrow

plural of essential infimum