i Register
In some senses, exordium is marked as formal. Watch for register when choosing this word.
noun
A beginning.
The introduction to an essay or discourse.
Cicero thinks, in discourses of philosophy, the exordium to be the hardest part: if it be so, I wisely lay hold on the conclusion.
The depreciation of her produce was next insisted upon; and I found this exordium led to the information that Messrs. Standish and Co. had been enabled, from the depressed state of the market, to lay in a large stock of Irish linen at unheard-of low prices.