im ‧ por ‧ tant ‧ ly /ɪmˈpɔːt ə ntli $ -ɔːr-/ BrE AmE adverb
[ Word Family: noun : ↑ importance ; adverb : ↑ importantly ; adjective : ↑ important ≠ ↑ unimportant ]
1 . [sentence adverb] used to show that your next statement or question is more, equally etc important than what you said before
more/most/less/equally importantly
Most importantly, you must keep a record of everything you do.
2 . in a way that shows you think that what someone is saying or doing is important:
He strode importantly into the room.