Where does “importantly” come from?

Importantly is the adverbial form of important, which derives from Middle English importance and Old English -līċ combined with Latin importāre, meaning "to bring in," from Latin in- and portāre.

importantly (English): In an important manner

Definitions

In an important manner

Ancestry of “importantly”, step by step

Step	Language	Word	Meaning
1	English	important	Having relevant and crucial value; Pompous;...
2	Middle English	important	—
3	Medieval Latin	importans	importing; introducing, causing
4	Latin	importo	I bring, carry or convey into; bring in from...
5	Latin	in-	un-, non-, not; in, within, inside
6	Latin	in	in, at, on, upon, from; within, while in; into,...
7	Old Latin	en	in
8	Proto-Italic	en	in
9	Proto-Indo-European	h₁én	in

Every word from Proto-Indo-European h₁én →