<prompt> Endemic disease is defined as a disease-Occurance regularly in expected frequencyOccurance irregularly from time to timeOccurance in excess of expected frequencyOccurance in large population  <response>: Ans. is a i.e., Occurance regularly in expected frequency Sporadic - Disease occuring irregularly from time to time. Endemic - Disease occuring regularly in expected frequency. Epidemic - Disease occuring in excess of expected frequency. Pandemic - Epidemic affecting a large proportion of population over a wide geographic area. 