v.
intr. To speak or write in an angry or violent manner; rave. v.
tr. To utter or express with violence or extravagance: a dictator who ranted his vitriol onto a captive audience. n.
Violent or extravagant speech or writing.
A speech or piece of writing that incites anger or violence: "The vast majority [of teenagers logged onto the Internet] did not encounter recipes for pipe bombs or deranged rants about white supremacy"(Daniel Okrent).
1598, from Du. randten "talk foolishly, rave," of unknown origin (cf. Ger. rantzen "to frolic, spring about"). The noun is first attested 1649, from the verb. Ranters "antinomian sect which arose in England c.1645" is attested from 1651; applied 1823 to early Methodists. A 1700 slang dictionary has rantipole "a rude wild Boy or Girl."