IPA: /ɪkˈsɛl.ənt.li/
KK: /ɛkˈsɛl ənt li/
In a way that shows great skill or quality; very well.
She performed excellently in the competition, impressing all the judges.
Excellently → It is formed from "excellent" (from Latin "excellens", meaning surpassing or outstanding) and the suffix "-ly" (meaning in a manner of). The word "excellently" means in a manner that surpasses or is outstanding.
Think of something that is 'surpassing' ('excellens') and done 'in a manner' ('-ly') — that's why excellently means done in an outstanding way.