[{"Bold_text": "adjective", "List Items": ["absolutely necessary; indispensable:Discipline is essential in an army.Synonyms: vital , intrinsic , inherent , basic , fundamental", "pertaining to or constituting the essence of a thing.Antonyms: accidental , extrinsic , extraneous , incidental", "noting or containing an essence of a plant, drug, etc.", "being such by its very nature or in the highest sense; natural; spontaneous:essential happiness.", "Mathematics.(of a singularity of a function of a complex variable) noting that the Laurent series at the point has an infinite number of terms with negative powers.(of a discontinuity) noting that the function is discontinuous and has no limit at the point.Compare removable(def2) removable(def2).", "(of a singularity of a function of a complex variable) noting that the Laurent series at the point has an infinite number of terms with negative powers.", "(of a discontinuity) noting that the function is discontinuous and has no limit at the point.Compare removable(def2) removable(def2)."]}, {"Bold_text": "noun", "List Items": ["a basic, indispensable, or necessary element; chief point:Concentrate on essentials rather than details."]}]