|Definition - The art and study of the use of persuasive and effective language.|
Etymology - The word derives from the Greek rhetorike techne, art of an orator (from rhetor, orator).
Oxford English Dictionary - Its first citation is from circa 1300:
"Geometrie, and arsmetrike, Rettorike, and ek fisike."
(13+ Seuyn Sag. 186 (W.))