IPA: /ɪmˈpɔːrtəntli/
KK: /ɪmˈpɔrtəntli/
In a way that shows significance or importance.
Importantly, we need to consider the impact of our decisions on the environment.
Importantly → It is formed from "import" (from Latin "importare", meaning to bring in) and the suffix "-ly" (meaning in a manner of). The word "importantly" means in a manner that brings in significance or importance.
Think of 'bringing in' ('import') something significant — that's why importantly means doing something in a significant way.