firstly

adverbattested in dialogue

//ˈfɜɹstli//

In the first place; before anything else; first.

adverb

1
In the first place; before anything else; first.
Firstly, I continue to base most species treatments on personally collected material, rather than on herbarium plants. […] Secondly, I continue to base my concepts on intensive study of a limited suite of collections, rather than superficial study of every packet that comes to hand.
We'll go into more depth with all the specs shortly so anyone less well versed in espresso speak will understand what I'm harping on about, but firstly let's just talk about using the machine.

Etymology

Coined before 1475, from Middle English fyrst-lyk, equivalent to first + -ly.

first · Preceding all others of a series or kind; the ordinal of one;…First · A surname.firsthand · Direct, without intermediate stages.

firstly · In the first place; before anything else; first.

Fischer · A surname from German [in turn originating as an occupation],…fish · A typically cold-blooded vertebrate animal that lives in…Fish · A surname.

The neighbouring pages — Alphabetical order follows the rules of the language, not byte values: an accent decides only between two otherwise identical words, and Spanish files Ñ as a letter of its own.