1. existential operator a logical quantifier of a proposition that asserts the existence of at least one thing for which the proposition is true
  2. essential hypertension persistent and pathological high blood pressure for which no specific cause can be found
  3. essential amino acid an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet
  4. unelaborated giving only major points; lacking completeness
  5. imperative requiring attention or action
  6. essential tremor tremor of unknown cause that develops in older people
  7. essential basic and fundamental
  8. essentiality basic importance
  9. antiapartheid opposing the policy of apartheid in South Africa
  10. elaborate marked by complexity and richness of detail
  11. sequential operation the sequential execution of operations one after another
  12. unadulterated without qualification
  13. exasperated greatly annoyed; out of patience
  14. unincorporated not organized and maintained as a legal corporation
  15. essential condition a prerequisite
  16. incorporated formed or united into a whole
  17. elaborated developed or executed with care and in minute detail
  18. identity operator an operator that leaves unchanged the element on which it operates
  19. inebriated stupefied or excited by a chemical substance
  20. essential oil an oil having the odor or flavor of the plant from which it comes; used in perfume and flavorings