IPA: /ˈprɪnsɪpəli/
KK: /ˈprɪnsəpəli/
In a main or primary way; mainly or mostly.
The project was principally funded by private donations.
**Principally** → It is formed from "princip-" (from Latin *principium*, meaning beginning or foundation) and "-ally" (meaning in a manner relating to). The word "principally" means in a manner relating to the main or primary aspect of something.
Think of 'princip-' as referring to the 'beginning' or 'foundation' of something, which helps you remember that 'principally' means relating to the main or primary aspect.