In 10 yearly cycles. Relating to decades.
“The warm fronts and hurricanes are decadal, we’re almost certain of that.”
Pompous or extravagant in language, style, or manner, especially in a way that is intended to impress.
Late 16th century: from Latin grandiloquus, literally ‘grand-speaking’, from grandis ‘grand’ + loqui ‘speak’. The ending was altered in English by association with eloquent.