noun

an address or communication emphatically urging someone to do something.

exhortations to consumers to switch off electrical appliances

urging,encouragement,persuasion,pressure,pressurization,pushing,insistence,incitement,goading,egging on,beseeching,admonishment,warning,paraenesis,enjoinder,call,charge,injunction,entreaty,appeal,admonition,sermon,lecture,harangue,obtestation,protreptic