Of a belief, attitude, etc.: prevalent or current among the general public; generally accepted, commonly known. Also (of a disease): †epidemic (obs…

Of a disease: affecting many individuals within a short period of time; suddenly and widely prevalent; = epidemic, adj. 1a. Also: of or relating…

Of a disease: affecting many individuals within a short period of time; suddenly and widely prevalent; = epidemic, adj. 1a.

That occurs as an epidemic.

Of an acute disease, esp. one that is not usually present in a region or population: affecting many individuals within a short period of time…

= epidemical, adj.