IPA: /ˌsɛrəˈmoʊnɪəli/
KK: /sɛrəˈmoʊnɪəli/
In a way that is related to a ceremony, often following traditional or formal practices.
The awards were presented ceremonially at the gala event.
Ceremonially is formed from "ceremony" (from Latin "caerimonia", meaning a religious or formal observance) and the suffix "-ally" (meaning in a manner relating to). The word "ceremonially" means in a manner relating to a ceremony or formal observance.
Think of a formal observance ('ceremony') and how it is done 'in a manner' ('-ally'). This helps you remember that ceremonially refers to doing something in a ceremonial way.