IPA: /ˈnæʃənəli/
KK: /ˈnæʃənəli/
In a manner that pertains to an entire country or nation.
The policy was implemented nationally to ensure equal access for all citizens.
Nationally → It is formed from "nation" (from Latin *natio*, meaning birth or race) and "-ally" (meaning in a manner relating to). The word "nationally" refers to something that relates to or is characteristic of a nation.
Think of 'nation' as a group of people born together, and remember that 'nationally' means in a manner relating to that group.