IPA: /ˌɛkstrəˈɔrdəˌnɛrəli/
KK: /ɛkˈstrɔrdəˌnɛrəli/
In a way that is very unusual or remarkable.
She performed extraordinarily well in the competition.
Extraordinarily → It is formed from "extra-" (meaning beyond) and "ordinarius" (from Latin, meaning ordinary or usual) and the suffix "-ly" (meaning in a manner). The word "extraordinarily" means in a manner that is beyond the ordinary or usual.
Think of something that goes 'beyond' ('extra-') what is 'ordinary' ('ordinarius') — that's why extraordinarily means something is very unusual or remarkable.