1. relating to or of the nature of an epidemic; affecting many people in a community at the same time
Usage: formal or technical usage; often used in medical and public health contexts
2. spreading rapidly and extensively; prevalent or widespread in a population
Usage: can be used figuratively beyond medical contexts

Examples

• The epidemical spread of influenza across the region prompted health officials to declare a state of emergency.
• Epidemical diseases require coordinated public health responses.
• The epidemical nature of the outbreak made containment difficult.
• Social media misinformation has become epidemical in recent years.
• Epidemical proportions of the illness were reported in the densely populated city.
• The epidemical rise in cases overwhelmed local hospitals.