1. essentiality basic importance
  2. essentialness basic importance
  3. essential basic and fundamental
  4. essential tremor tremor of unknown cause that develops in older people
  5. essential oil an oil having the odor or flavor of the plant from which it comes; used in perfume and flavorings
  6. essentially at bottom or by something's very nature
  7. essential amino acid an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet
  8. inessentiality not of basic importance
  9. essential hypertension persistent and pathological high blood pressure for which no specific cause can be found
  10. essential condition a prerequisite
  11. asynclitism the presentation during labor of the head of the fetus at an abnormal angle
  12. existentialism a philosophy that assumes that people are entirely free
  13. Ascension Day celebration of the Ascension of Christ into heaven
  14. exponential decay a decrease that follows an exponential function
  15. optical disk a disk coated with plastic that can store digital data as tiny pits etched in the surface; is read with a laser that scans the surface
  16. residential district a district where people live
  17. assenting agreeing with or consenting to (often unwillingly)
  18. inertial mass (physics) the mass of a body as determined by the second law of motion from the acceleration of the body when it is subjected to a force that is not due to gravity
  19. presidential term the tenure of a president
  20. existentialist a philosopher who emphasizes freedom of choice and personal responsibility but who regards human existence in a hostile universe as unexplainable