IPA: /ˌɪntəˈnæʃənəli/
KK: /ˌɪntəˈnæʃənəli/
In a way that involves or relates to multiple countries around the world.
The conference was attended internationally by experts from various fields.
Internationally → It is formed from "inter-" (meaning between) and "natio" (from Latin, meaning nation) and the suffix "-al" (meaning pertaining to) and "-ly" (meaning in a manner). The word describes something that pertains to or occurs between nations.
Think of things that happen 'between' ('inter-') different 'nations' ('natio') — that's why internationally means in a manner that involves multiple nations.