epidemica widespread occurrence of an infectious disease in a community at a particular timeThe cholera epidemic of 1854 in London led to major advances in public health and sanitation.NoteThe cholera epidemic of 1854 in London led to major advances in public health and sanitation.Elon.io is an online learning platformWe have an entire course teaching TOEFL Academic Vocabulary grammar and vocabulary.Start learning TOEFL Academic Vocabulary now