Wikipedia
Grand style (rhetoric)
The grand style (also referred to as 'high style') is a style of rhetoric, notable for its use of figurative language and for its ability to evoke emotion. It was coined by Matthew Arnold. It is mostly used in longer speeches and can be used, as by Cicero, to influence an audience around a particular belief or ideology. The style is highly ornamented with stylistic devices such as metaphors and similes, as well as the use of personification. In poetry, it adopts strict adherence to metre.