speech act - the use of language to perform some act

apprisal, notification, telling - informing by words

revelation - communication of knowledge to man by a divine or supernatural agency

intro, introduction, presentation - formally making a person known to another or to the public

briefing - detailed instructions, as for a military operation

account, report - the act of informing by verbal report; "he heard reports that they were causing trouble"; "by all accounts they were a happy couple"

warning - a message informing of danger